List of highways in Puerto Rico
Puerto Rico Highway System  

Highway names  
Interstates  Interstate PRnn (PRInn) (unsigned) 
Commonwealth:  Puerto Rico Highway nn (PRnn) 
System links  
The highway system in Puerto Rico is composed of approximately 14,400 kilometers (8,900 mi)^{[1]} of roads in Puerto Rico, maintained by the Puerto Rico Department of Transportation and Public Works (Spanish: Departmento de Transportación y Obras Públicas) or DTOP. The highway system in Puerto Rico is divided into four networks: primary, urban primary, secondary or intermunicipal, and tertiary or local (Spanish: red primaria, red primaria urbana, red secundaria o intermunicipal, and red terciaria o local).^{[1]} Highways may change between networks and retain their same numbers.
Highway markers
Puerto Rico roads are classified according to the network they belong to. There are four types: primary, urban primary, secondary, and tertiary.^{[1]}^{[2]}
In this regard, a primary road is one which is part of the primary network, an urban primary road is part of the urban primary network, etc. Generally, the same highway may change between networks, but the highway will continue to have the same number. For example, PR1, connecting Ponce and San Juan, is signed as urban primary inside the Ponce city limits, then it is signed as secondary in Ponce's rural barrio Capitanejo, and then it is again signed as urban primary on its entry into the town of Santa Isabel.
Primary roads are numbered 1 through 99, secondary roads are numbered 100 to 299, and tertiary roads are numbered 300 to 9999.^{[3]} In 2009, primary routes comprise about 14% of the total Commonwealth system mileage, secondary about 30%, and tertiary (municipal) about 56% of the total mileage.^{[3]}
Route number markers on PR191 in 2009; on the left is the tertiary highway marker, in the middle is a Forest Highway marker, and on the right is a pre1999 marker.
 ^ ^{a} ^{b} Just as some highways numbered 1–99 may have secondary or tertiary network type markers on specific segments of their roadways, some highways numbered 100–299 may also have tertiary network markers—black numbers on white circles set against a black square—in specific segments of those highways, to indicate that such portions of the highway are part of the tertiary network.
Less common markers
At least two^{[1]} other markers can be observed in Puerto Rico roads today (2019). The first is the older style road marker which, above the route number, also had the outline of the main island of Puerto Rico with the words Puerto Rico on the outline as shown here. Until 1999,^{[4]} all nontolled numbered highways in Puerto Rico had the same route marker, a square with a whiteonblack halfcircle with the route number in the bottom two thirds and a map of Puerto Rico with the words Puerto Rico written inside in the top third. A second road marker, used on the road through El Yunque National Forest, is the browncolored upsidedown trapezoidal marker with the road number on the top twothirds of the sign and the words Bosque Nacional (national forest) on the bottom onethird, as shown.
Roadway maintenance
All Puerto Rico Highway System roads, regardless of the classification used, are maintained by the centralized, Commonwealthlevel, Departmento de Transportación y Obras Públicas (DTOP). Municipal governments are not responsible for maintenance of the Puerto Rico Highway System roads within their territory; whether or not the municipal government is an autonomous government, DTOP is the responsible agency.^{[5]} The DTOP maintains a network of regional offices throughout the island which carry out DTOP work within their multimunicipality region. Municipal governments are only responsible for maintenance of city and town streets within their jurisdictions.^{[6]} On occasion, the central government has entered into memoranda of agreement with municipal governments for the collaborative maintenance of some Puerto Rico Highway System roadways within their municipalities.^{[7]}^{[8]}
Municipal roads
In Puerto Rico, the term municipal road may be encountered occasionally. This is not a “fourth” network of State roads. Roadways that have both their terminus within the same municipality are called tertiary roads and are, by convention, numbered PR300 through PR9999. Tertiary roads are also sometimes called Carreteras de la red local (English: Local network roads).^{[2]}
However, the term municipal road or municipal highway (Spanish: Carretera municipal) refers to any public roadway that is not marked with a Puerto Rico road marker.^{[9]} Roadways marked with a Puerto Rico road marker are those public roadways that include PR followed by a number in its markers. Such roads are considered State roads and part of the Puerto Rico Highway System. Public roadways that do not include such markings are termed municipal roadways. Unlike State roads, which are signed with numbers, municipal roads are signed with names, such as Calle Hostos, Calle De Diego, Calle San Jorge, Calle León M. Acuña.^{[9]}
Tertiary roads are not municipal roads even though at times the term municipal road has been used (as a shortcut to intramunicipal road)—even by the Government of Puerto Rico—to refer to a tertiary State road.^{[3]} The confusion comes from the context in which the phrase municipal road occurs. When the term municipal road occurs in the context of roads owned and maintained by the State government, municipal roads means tertiary State network roads. In this context, a municipal road and a State tertiary road both refer to the same network of State roads. However, if the term occurs in the context of roadways owned and maintained by a municipal government, it refers to the network of local streets and roadways that make up the urban landscape of a municipality.
Another context sometimes encountered is the context of how a road is used, that is, the purpose of a road. The purpose of a road is indicative of whether a road is a municipal road or not. In its strictest meaning, the term municipal roads refers to roads within a municipality's urban center that provide access from one urban neighborhood to another urban neighborhood within the same urban area (city, town, poblado, etc.), while in the larger context of the State highway system, municipal roads refers to roads that “provide access to the main urban area of a municipality from peripheral communities” (that is, tertiary roads).^{[1]} Municipal roads are maintained by the municipal government where those roads occur, while tertiary roads are maintained by the State government. As stated under the section Road maintenance, at times the State government has entered into Memorandums of Agreement with municipal governments for the upkeep of a State tertiary roadway (note this is a Stateowned road that runs entirely within a single municipality), but this does not make it a municipal road—the road continues to maintain its State signage and ownership.^{[7]}^{[8]}
Expressways
Highways with control access fall into three types: An expressway is an arterial highway with full or partial control of access. Expressways with full control of access are termed freeways. If the freeway charges a toll for its use, it is called an autopista.^{[3]} Most tollbooths accept the AutoExpreso, an electronic toll collection system, to avoid traffic congestion.^{[10]}^{[11]} Toll roads between San Juan and Arecibo, and between San Juan and Ponce were envisioned by J. Raymond Watson, a Puerto Rican engineer, in 1970.^{[12]}
All Puerto Rico expressways are signed either as primary or as urban primary routes.
Autopista Luis A. Ferré (PR52) heading east from Juana Díaz towards Santa Isabel
A stretch of Autopista Roberto Sánchez Vilella (PR66) heading east to Río Grande
Route  Name  Terminus  Maximum speed limit  Notes 

PR2  Expreso Kennedy  Starts from San Patricio Plaza (Guaynabo) to Santurce (San Juan, aka Parada 18).  50 mph (80 km/h)  Guaynabo to San Juan section only. 
PR2  Roberto Sánchez Vilella  Starts from Mayagüez Mall (Mayagüez) to PR1 in Ponce  55 mph (90 km/h)  Mostly converted to expressway from Mayagüez Mall to Ponce. 
PR5  Expreso Río Hondo  Bayamón, PR22 to Naranjito, PR147 and PR149 with discontinuity between PR199 in Bayamón and PR167 in Toa Alta.  50 mph (80 km/h)  Tolled. This road has three expressway segments as of April 2012—these are between PR29 and PR22 and between PR2 and PR199 (both in Bayamón), an unbuilt portion in southern Bayamón and a portion between PR167 (Toa Alta) and the town of Naranjito. 
PR9  Baldorioty de Castro  PR10 Barrio Portugués to PR2 Barrio El Tuque  55 miles per hour (89 km/h) to 65 miles per hour (105 km/h)  From PR123 to PR2 still under construction 
PR12  Santiago de los Caballeros  PR14 Barrio Machuelo Abajo to PR123 Barrio Playa  55 miles per hour (89 km/h)  
PR18  Expreso Las Américas  PR22 San Juan and PR52 San Juan  55 to 65 mph (90 to 110 km/h)  
PR20  Expreso Rafael Martínez Nadal  PR2 in the San Patricio area in Guaynabo to PR1 in La Muda sector in Caguas  55 mph (90 km/h)  Tolled 
PR22  Autopista José de Diego  Hatillo, PR2 to San Juan, PR26  65 mph (105 km/h)  Extension to Aguadilla in planning. Tolled 
PR26  Expreso Román Baldorioty de Castro  San Antonio Bridge (Bridge to Old San Juan Island) to PR3 in Carolina.  65 mph (105 km/h)  
PR30  Expreso Cruz Ortiz Stella  Caguas, PR1 to Humacao, PR53  55 mph (90 km/h)  
PR52  Autopista Luis A. Ferré  Ponce, PR2 to San Juan, PR1 and PR18  65 mph (105 km/h)  Tolled. This highway is the longest tolled freeway in Puerto Rico. 
PR53  Autopista Dr. José Celso Barbosa  Fajardo through Ceiba to Yabucoa, and then Guayama to Salinas.  65 mph (105 km/h)  Maunabo tunnels constructed in October 2008. The segments between Yabucoa and Maunabo still incomplete. 
PR60  Avenida Dionisio Casillas  Humacao, PR30 to Humacao, PR3  55 mph (90 km/h)  
PR66  Autopista Roberto Sánchez Vilella  PR3 in Carolina and Río Grande  65 mph (105 km/h)  Second half opened in October 2012 to Río Grande. Tolled. 
PR165  Expreso El Caño  Guaynabo, PR2 and PR23 to Cataño  50 mph (80 km/h) 
List of highways
Below is a list of some highways in Puerto Rico along with the municipalities where they begin and end.
Primary highways
Primary roads are numbered in the 1 to 99 range and are distributed randomly throughout the island.
This list is incomplete; you can help by adding missing items. 
Number  Length (mi)  Length (km)  Southern or western terminus  Northern or eastern terminus  Formed  Removed  Notes  

PR1  79.6  128.1  PR123 in Ponce  Calle Tanca in San Juan  —  —  Carretera Central  
PR2  143.0  230.1  PR1 / PR133 in Ponce  PR26 in San Juan  —  —  
PR2R  0.5  0.80  PR440 in Aguadilla  PR2 in Aguadilla  —  —  Aguadilla business spur  
PR2R  —  —  PR2 / PR114 in Mayagüez  PR2 in Mayagüez  —  —  Mayagüez business loop; renumbered to PR239^{[13]}  
PR2R  1.01^{[14]}  1.63  PR2 / PR5549 in Ponce  PR123 in Ponce  —  —  Ponce business spur; formerly PR2  
PR3  99.9  160.8  PR1 in Salinas  PR1 in San Juan  —  —  
PR3R  0.87  1.40  PR3 in Humacao  PR3 in Humacao  —  —  Humacao business loop  
PR4  —  —  PR17 in San Juan  PR26 in Carolina  —  —  Became part of PR8  
PR4  —  —  PR114 in Hormigueros  PR102 in San Germán  —  —  Renumbered to PR103 and PR101^{[15]}  
PR5  16.0  25.7  PR152 / PR164 in Naranjito  Calle Canal in Cataño  —  —  Tolled in Bayamón. Exists in two segments due to an unconstructed portion in Bayamón.  
PR5  —  —  PR2 in Aguadilla  PR2 in Aguadilla  1953^{[16]}  —  Renumbered to PR107 and PR110^{[16]}  
PR6  1.1  1.8  PR2 in Bayamón  PR5 in Bayamón  —  —  Formerly PR21  
PR8  2.5  4.0  PR17 in San Juan  PR3 in San Juan  —  —  Formerly PR4  
PR9  4.52^{[17]}  7.27  PR2 / PR52 in Ponce  PR10 in Ponce  —  —  Exists in two portions, as the portion between PR123 and PR500 is actually under construction.  
PR10  42.42^{[18]}  68.27  PR5506 in Ponce  PR2 in Arecibo  —  —  Exists in two segments due to a stillunderconstruction portion between Adjuntas and Utuado. Much of old route now PR123; the current alignment dates from 1974.  
PR12  3.28^{[19]}  5.28  Port of Ponce  PR14 in Ponce  1960^{[20]}^{[a]}  current  
PR14  45.4  73.1  PR123 / PR123P in Ponce  PR1 in Cayey  —  —  Carretera Central  
PR14R  0.56  0.90  PR123 / PR123P in Ponce  PR14 / PR14P in Ponce  —  —  Ponce business spur  
PR15  16.03  25.80  PR3 in Guayama  PR14 in Cayey  1953^{[21]}  current  Part of the Ruta Panorámica  
PR16  0.53  0.85  Calle Miraflores in San Juan  PR1 / PR26 in San Juan  —  —  
PR17  7.1  11.4  PR19 in San Juan  PR26 in Carolina  —  —  Tolled at the Teodoro Moscoso Bridge.  
PR18  3.78^{[19]}  6.08  PR1 / PR52 in San Juan  PR22 in San Juan  —  —  
PR19  1.2  1.9  PR21 in San Juan  PR2 in Guaynabo  —  —  PR19 is the main avenue in San Patricio, Guaynabo.  
PR20  6.03^{[19]}  9.70  PR1 in Guaynabo  PR2 in Guaynabo  —  —  Tolled  
PR21  3.1  5.0  PR19 in San Juan  PR1 / PR176 in San Juan  —  —  
PR22  52.01^{[19]}  83.70  PR2 in Hatillo  PR26 in San Juan  1969^{[22]}  current  Tolled; portion of unsigned Interstate PRI2  
PR23  4.0  6.4  PR2 / PR165 in Guaynabo  PR27 in San Juan  —  —  
PR24  1.1  1.8  PR165 in Guaynabo  PR888 in Cataño  —  —  
PR25  6.9  11.1  PR3 in San Juan  Calle Fortaleza / Calle Recinto Sur in San Juan  —  —  Avenida Juan Ponce de León  
PR25R  1.7  2.7  PR1 in San Juan  PR25 in San Juan  —  —  
PR26  9.63^{[19]}  15.50  PR1 / PR16 in San Juan  PR3 / PR66 in Carolina  —  —  
PR27  3.0  4.8  PR3 in San Juan  PR36 in San Juan  —  —  
PR28  3.7  6.0  PR5 in Bayamón  PR2 in San Juan  —  —  
PR29  2.2  3.5  PR2 in Bayamón  PR5 in Bayamón  —  —  
PR30  19.08^{[19]}  30.71  PR1 in Caguas  PR53 in Humacao  —  —  
PR31  15.88  25.56  PR30 / PR189 in Juncos  PR3 in Naguabo  1953^{[23]}  current  
PR32  4.5  7.2  PR172 in Caguas  PR1 in Caguas  —  —  
PR33  1.37  2.20  PR183 in Caguas  PR1 / PR189 in Caguas  —  —  
PR34  3.7  6.0  PR196 in Caguas  PR183 in Caguas  —  —  
PR35  2.5  4.0  PR1 in San Juan  PR16 in San Juan  —  —  
PR36  0.93  1.50  PR25 in San Juan  PR27 in San Juan  —  —  
PR37  4.2  6.8  PR35 in San Juan  PR187 in Carolina  —  —  
PR38  0.67  1.08  Calle Recinto Sur in San Juan  PR25 in San Juan  —  —  
PR39  0.56  0.90  PR1 in San Juan  PR25 in San Juan  —  —  
PR40  0.56  0.90  PR25 in San Juan  PR27 in San Juan  —  —  
PR41  1.5  2.4  PR17 in San Juan  PR25 in San Juan  —  —  
PR42  0.62  1.00  PR39 in San Juan  Calle Lafayette in San Juan  —  —  
PR47  1.7  2.7  Calle Ferrocarril / Paseo De Diego in San Juan  PR3 in San Juan  —  —  
PR52  67.30^{[19]}  108.31  PR2 / PR9 in Ponce  PR1 / PR18 in San Juan  1968^{[22]}  current  Tolled; portion of unsigned Interstate PRI1  
PR53  58.4  94.0  PR52 in Salinas  PR3 in Fajardo  1988^{[22]}  current  Tolled. Exists in four portions due to unconstructed segments between Guayama and Yabucoa; portion of unsigned Interstate PRI3  
PR54  3.85  6.20  PR53 in Guayama  PR3 / PR748 in Guayama  —  —  
PR60  2.21^{[19]}  3.56  PR30 in Humacao  PR3 in Humacao  —  —  Former portion of PR30  
PR63  0.37  0.60  PR102 in Mayagüez  PR2 in Mayagüez  —  —  
PR64  3.4  5.5  PR102 / PR3342 in Mayagüez  PR2 / PR342 in Mayagüez  —  —  
PR65  0.57  0.92  PR239 in Mayagüez  PR106 in Mayagüez  —  —  
PR66  12.1  19.5  PR3 / PR26 in Carolina  PR3 / PR187 in Río Grande  2006^{[24]}  current  Tolled; portion of unsigned Interstate PRI3  

Secondary highways
Secondary roads are numbered in the 100 to 299 range. Unlike primary highways, which are numbered randomly throughout the island, secondary highways generally follow a grid pattern. They begin from the southwest portion of the island with PR100 and increase in number as you progress in a northeasterly fashion. PR100 is located in the southwestern town of Cabo Rojo, whilst PR198 is in Juncos, Las Piedras and Humacao in the eastern part of Puerto Rico. The highest secondary highway number assigned so far (February 2014) is 252 (PR252), located in the northeastern municipalityisland of Culebra. A few roads “violate” this grid order; for example, PR199 lies in Guaynabo and San Juan.
This list is incomplete; you can help by adding missing items. 
Number  Length (mi)  Length (km)  Southern or western terminus  Northern or eastern terminus  Formed  Removed  Notes  

PR100  10.1  16.3  PR301 in Cabo Rojo  PR2 in Hormigueros  —  —  
PR101  11.9  19.2  Calle José de Diego in Cabo Rojo  PR102 in San Germán  —  —  
PR102  25.8  41.5  PR104 in Mayagüez  PR121 / PR368 in Sabana Grande  —  —  
PR103  8.1  13.0  PR101 in Cabo Rojo  PR114 in Cabo Rojo  1953^{[25]}  current  
PR104  1.1  1.8  PR3108 in Mayagüez  PR2 in Mayagüez  —  —  
PR105  27.5  44.3  Calle Tamarindo in Mayagüez  PR128 in Maricao  —  —  Part of the Ruta Panorámica  
PR106  11.7  18.8  Calle Méndez Vigo / Calle Oriente in Mayagüez  PR120 in Las Marías  —  —  Part of the Ruta Panorámica  
PR107  2.8  4.5  PR2 in Aguadilla  Borinquen Road in Aguadilla  —  —  
PR108  13.7  22.0  Calle Méndez Vigo in Mayagüez  PR109 in Añasco  —  —  
PR109  18.3  29.5  PR2 in Añasco  PR119 in San Sebastián  —  —  
PR110  20.5  33.0  PR2 in Añasco  Cliff Road / San Antonio Road in Aguadilla  —  —  
PR110R  —  —  PR110 in Moca  PR110 in Moca  —  —  Moca business loop; renumbered to PR4025^{[26]}  
PR110R  —  —  PR110 in Aguadilla  Ramey Air Force Base in Aguadilla  —  —  Aguadilla spur; renumbered to PR4010  
PR111  41.9  67.4  PR2 / PR1107 in Aguadilla  PR140 in Utuado  1953^{[27]}  current  
PR111R  —  —  PR111 in Aguadilla  PR111 in Aguadilla  —  —  Aguadilla business loop; renumbered to PR1107P  
PR111R  —  —  PR119 / PR125 in San Sebastián  PR111 in San Sebastián  —  —  San Sebastián spur; renumbered to PR125  
PR111R  —  —  PR111 in Lares  PR111 in Lares  —  —  Lares business loop; renumbered to PR1111  
PR111R  —  —  PR123 in Utuado  PR111 in Utuado  —  —  Utuado business loop; renumbered to PR6111  
PR112  11.2  18.0  PR125 in Moca  PR113 / PR459 in Isabela  —  —  
PR113  12.3  19.8  PR112 / PR459 in Isabela  PR119 in Camuy  1953^{[28]}  current  
PR114  9.1  14.6  PR2 / PR239 in Mayagüez  PR102 in San Germán  —  —  
PR115  17.3  27.8  PR2 / PR109 in Añasco  PR1107 in Aguadilla  —  —  
PR115R  —  —  PR417 in Aguada  PR115 in Aguada  —  —  Aguada business spur; renumbered to PR4415^{[29]}  
PR116  16.5  26.6  PR101 in Lajas  PR2 in Guánica  1953^{[30]}  current  
PR116R  —  —  PR116 in Guánica  PR116 in Guánica  —  —  Guánica business loop; renumbered to PR4116  
PR116R  —  —  PR116 in Guánica  PR121 in Yauco  —  —  Renumbered to PR1116, now PR326^{[31]}  
PR117  8.1  13.0  PR315 in Lajas  PR121 in Sabana Grande  —  —  
PR118  3.1  5.0  PR117 in Lajas  PR102 in San Germán  —  —  
PR119  49.5  79.7  PR2 in San Germán  PR2 in Hatillo  1953^{[28]}  current  Part of the Ruta Panorámica  
PR120  20.4  32.8  Calle Neponucema Santiago / Calle 65 de Infantería in Sabana Grande  PR124 in Las Marías  —  —  Part of the Ruta Panorámica  
PR121  9.6  15.4  PR102 / PR368 in Sabana Grande  PR127 / PR128 in Yauco  —  —  
PR122  4.2  6.8  PR116 in Lajas  PR2 in San Germán  —  —  Exists in two segments due to a stillunderconstruction portion between Lajas and San Germán.  
PR123  48.72  78.41  PR12 in Ponce  PR10 / PR6609 in Arecibo  1910  c.current  Was PR10 until 1974  
PR124  16.7  26.9  PR119 in Las Marías  PR1111 in Lares  1953^{[27]}  current  
PR125  13.1  21.1  PR111 in Aguadilla  PR111 in San Sebastián  —  —  Formerly PR111  
PR125R  0.59  0.95  PR125 in San Sebastián  PR109 in San Sebastián  —  —  San Sebastián business spur  
PR127  11.0  17.7  PR121 / PR128 in Yauco  PR2 in Peñuelas  —  —  
PR128  36.5  58.7  PR2 / PR3334 in Yauco  PR1111 / PR4128 in Lares  1953^{[27]}  current  Part of the Ruta Panorámica  
PR129  26.8  43.1  PR135 in Adjuntas  PR2 in Arecibo  1953^{[32]}  current  
PR130  7.5  12.1  PR129 in Hatillo  PR119 in Hatillo  1953^{[32]}  current  
PR131  5.0  8.0  Guilarte Forest in Adjuntas  PR135 in Adjuntas  1953^{[33]}  current  Part of the Ruta Panorámica  
PR132  16.1  25.9  PR2 / PR136 in Guayanilla  PR123 in Ponce  1953^{[34]}  current  
PR133  1.2  1.9  PR123 / PR1P in Ponce  PR1 / PR2 in Ponce  —  —  
PR134  10.9  17.5  PR111 in Lares  PR129 in Hatillo  —  —  Formerly PR129  
PR135  14.0  22.5  PR128 in Lares  PR123 in Adjuntas  1953^{[33]}  current  Part of the Ruta Panorámica  
PR136  0.21  0.34  PR127 in Guayanilla  PR2 / PR132 in Guayanilla  —  —  
PR137  11.1  17.9  PR155 in Morovis  PR2 in Vega Baja  —  —  
PR138  1.6  2.6  PR14 / PR153 in Coamo  PR155 in Coamo  —  —  
PR139  15.7  25.3  PR10 / PR14 in Ponce  PR143 in Ponce  —  —  
PR139R  1.8  2.9  PR139 / PR5139 in Ponce  Parque Luis A. "Wito" Morales in Ponce  —  —  Spur to Parque Luis A. "Wito" Morales and Cerillos Dam  
PR140  43.4  69.8  PR143 in Jayuya  PR2 in Barceloneta  1953^{[35]}  current  
PR141  12.9  20.8  PR144 in Jayuya  PR140 in Utuado  1953^{[35]}  current  
PR142  5.10^{[36]}  8.21  PR159 in Corozal  PR2 in Dorado  —  —  
PR143  36.5  58.7  PR123 in Adjuntas  PR162 in Barranquitas  1953^{[37]}  current  Part of the Ruta Panorámica  
PR144  11.4  18.3  PR140 in Jayuya  PR149 in Ciales  1953^{[35]}  current  
PR145  4.7  7.6  PR146 / PR149 in Ciales  PR155 / PR634 in Morovis  —  —  
PR146  17.6  28.3  PR123 in Arecibo  PR145 / PR149 in Ciales  —  —  
PR147  —  —  PR152 / PR164 in Naranjito  PR164 in Naranjito  —  —  Became part of PR5  
PR148  0.5  0.80  PR164 / PR167 in Naranjito  PR5 / PR826 in Naranjito  —  —  
PR149  45.3  72.9  PR1 in Juana Díaz  PR22 in Manatí  1953^{[38]}  current  
PR149R  0.7  1.1  PR149 in Villalba  PR149 in Villalba  —  —  Villalba business loop; formerly PR149  
PR150  13.5  21.7  PR149R in Villalba  PR14 in Coamo  1953^{[38]}  current  
PR151  7.8  12.6  PR150 in Villalba  PR143 in Villalba  1953^{[38]}  current  
PR152  12.6  20.3  PR156 in Barranquitas  PR5 / PR164 in Naranjito  1953^{[39]}  current  
PR152R  2.0  3.2  PR143 in Barranquitas  PR152 in Barranquitas  —  —  Barranquitas bypass  
PR153  8.9  14.3  PR1 in Santa Isabel  PR14 / PR138 in Coamo  1953^{[40]}  current  
PR154  2.5  4.0  PR153 in Coamo  PR543 in Coamo  1953^{[40]}  current  
PR155  42.9  69.0  PR14 in Coamo  PR2 / PR688 in Vega Baja  1953^{[41]}  current  
PR156  36.5  58.7  PR597 / PR5155 in Orocovis  PR1P in Caguas  1953^{[42]}  current  
PR157  15.1  24.3  PR149 in Ciales  PR155 in Orocovis  1953^{[37]}  current  
PR158  —  —  PR52 in Cayey  PR1 in Cayey  proposed^{[43]}  —  
PR158  —  —  PR1 in Juana Díaz  Fort Allen in Juana Díaz  —  —  Now Calle 158  
PR159  12.8  20.6  PR155 / PR6623 in Morovis  PR165 in Toa Alta  1953^{[41]}  current  
PR160  9.5  15.3  PR159 in Morovis  PR2 in Vega Baja  1953^{[44]}  current  
PR161  1.5  2.4  PR1 in Santa Isabel  PR1 in Santa Isabel  —  —  Santa Isabel northern bypass  
PR162  11.8  19.0  PR1 in Aibonito  PR156 in Barranquitas  1953^{[45]}  current  
PR163  2.8  4.5  PR500 in Ponce  PR2 in Ponce  1960^{[46]}  current  Part of the Avenida Las Américas  
PR164  10.2  16.4  PR159 in Corozal  PR148 / PR167 in Naranjito  1953^{[47]}  current  
PR165  24.2  38.9  PR164 in Naranjito  PR2 / PR23 in Guaynabo  1953^{[39]}  current  
PR165R  0.4  0.64  PR165 in Toa Alta  PR861 in Toa Alta  —  —  Toa Alta business spur  
PR166  1.7  2.7  PR102 in San Germán  PR122 in San Germán  —  —  
PR167  17.6  28.3  PR156 / PR7167 in Comerío  PR165 in Toa Baja  1953^{[42]}  current  
PR168  1.1  1.8  PR2 in Bayamón  Calle Reverendo Domingo Marrero Navarro / Calle Río Cialitos in Bayamón  —  —  
PR169  3.1  5.0  PR1 / PR8834 in Guaynabo  PR20 in Guaynabo  —  —  
PR170  1.4  2.3  PR206 in Cayey  PR14 / PR731 in Cayey  1953^{[21]}  current  
PR171  5.2  8.4  PR14 in Cayey  PR172 / PR734 in Cidra  1953^{[21]}  current  
PR172  17.6  28.3  PR156 in Comerío  PR1 in Caguas  1953^{[42]}  current  
PR173  20.0  32.2  PR14 in Aibonito  PR1 / PR8834 in Guaynabo  1953^{[45]}  current  
PR174  14.1  22.7  PR156 in Aguas Buenas  PR5 in Bayamón  —  —  
PR175  8.1  13.0  PR1 in Caguas  PR181 / PR8860 in Trujillo Alto  1953^{[48]}  current  
PR176  7.3  11.7  PR175 in Trujillo Alto  PR1 / PR21 in San Juan  1953^{[48]}  current  
PR177  6.5  10.5  PR174 in Bayamón  PR176 in San Juan  —  —  
PR178  2.0  3.2  PR3 in Arroyo  PR3 / PR753 in Arroyo  1953^{[49]}  current  Arroyo business loop  
PR179  12.6  20.3  PR15 in Guayama  PR184 in Cayey  —  —  Part of the Ruta Panorámica  
PR180  1.7  2.7  PR701 in Salinas  PR1 / PR52 in Salinas  —  —  Salinas bypass  
PR181  42.66  68.65  PR3 in Patillas  PR17 in San Juan  1953^{[50]}  current  Part of the Ruta Panorámica  
PR182  9.9  15.9  PR181 in Yabucoa  PR3 in Yabucoa  1953^{[51]}  current  Part of the Ruta Panorámica  
PR183  13.9  22.4  PR1 in Caguas  PR198 in Las Piedras  1953^{[23]}  current  
PR184  20.8  33.5  PR3 in Patillas  PR1 in Cidra  1953^{[21]}  current  Part of the Ruta Panorámica  
PR185  13.1  21.1  PR30 in Juncos  PR9959 in Canóvanas  1953^{[23]}  current  
PR186  16.7  26.9  PR185 in Canóvanas  PR3 in Río Grande  1953^{[52]}  current  
PR187  18.7  30.1  PR26 in Carolina  PR3 / PR66 in Río Grande  1953^{[52]}  current  
PR187R  0.68  1.09  PR3 in Río Grande  PR187 in Río Grande  —  —  Río Grande business spur  
PR188  3.6  5.8  PR3 / PR9188 in Canóvanas  PR187 in Loíza  —  —  
PR189  9.4  15.1  PR1 / PR33 in Caguas  PR30 / PR31 in Juncos  —  —  
PR190  2.5  4.0  PR3 / PR8887 in Carolina  PR26 in Carolina  —  —  
PR191  14.9  24.0  PR31 in Naguabo  PR3 in Río Grande  1953^{[52]}  current  Exists in two segments in the El Yunque National Forest.  
PR192  1.9  3.1  PR3 in Naguabo  PR31 in Naguabo  1953^{[53]}  current  
PR193  1.5  2.4  PR3 in Luquillo  PR3 / PR992 in Luquillo  —  —  Luquillo business loop  
PR194  3.0  4.8  PR3 in Fajardo  PR3 / PR940 in Fajardo  —  —  
PR195  2.1  3.4  PR3 in Fajardo  Port of Fajardo  —  —  
PR196  1.7  2.7  PR156 in Caguas  PR1 in Caguas  —  —  
PR198  9.2  14.8  PR31 in Juncos  PR3 in Humacao  —  —  
PR198R  0.50  0.80  PR198 in Humacao  PR198 in Humacao  —  —  
PR199  13.4  21.6  Urbanización Portobello in Toa Alta  PR181 / PR876 in Trujillo Alto  —  —  PR199 exists into two segments due to an unconstructed portion between Bayamón and Guaynabo.  
PR200  3.91^{[54]}  6.29  PR994 in Vieques  Barrio Puerto Diablo in Vieques  —  —  
PR200R  0.93^{[54]}  1.50  PR200 in Vieques  Sector Santa María in Vieques  —  —  
PR201  4.47^{[54]}  7.19  Barrio Llave in Vieques  PR200 in Vieques  —  —  
PR203  4.2  6.8  PR183 / PR9931 in San Lorenzo  PR30 in Gurabo  —  —  
PR204  1.4  2.3  PR183 in Las Piedras  PR198 in Las Piedras  —  —  
PR204  —  —  PR2 in Barceloneta  PR140 in Barceloneta  —  —  Renumbered to PR140  
PR205  0.25  0.40  PR31 in Naguabo  PR53 in Naguabo  —  —  
PR206  1.1  1.8  PR1 in Cayey  PR14 in Cayey  —  —  
PR208  —  —  PR156 in Aguas Buenas  PR156 in Aguas Buenas  proposed^{[55]}  —  Aguas Buenas northern bypass  
PR212  1.6  2.6  PR2 / PR4494 in Isabela  PR4472 in Isabela  —  —  Formerly portion of PR4494 extension  
PR238  3.1  5.0  PR153 in Coamo  PR14 in Coamo  —  —  Former portion of PR138  
PR239  3.3  5.3  PR2 / PR114 in Mayagüez  PR2 in Mayagüez  —  —  Formerly PR2R^{[13]}  
PR250  5.47^{[56]}  8.80  Port of Culebra  Zoni Beach in Culebra  —  —  Formerly PR998^{[57]}  
PR251  1.74^{[56]}  2.80  PR250 in Culebra  Flamenco Beach in Culebra  —  —  Formerly PR999^{[57]}  
PR252  0.93  1.50  PR250 in Culebra  Barrio Playa Sardinas I in Culebra  —  —  
PR253  1.99^{[56]}  3.20  Calle Punta Soldado in Culebra  PR250 in Culebra  —  —  

Tertiary highways
Tertiary highways also follow a general grid. Towns which do not border the Atlantic Ocean or the Caribbean Sea, especially in the mountainous area, may overlap this grid, for example Ciales may have both highways in the 600699 grid and the 500599 grid, depending where they begin further north or further south. Generally along the areas where the highways are, the lower the number, the more south it is. Culebra is the only town in Puerto Rico that does not fall in any of the regions, for only PR250 and PR251 are the main routes. The entire immediate metropolitan area of San Juan with the exception of Caguas falls in the 800 region, while the entire east coast (north and south) east of San Juan, Caguas and Patillas fall in the 900 region. This is because the eastern portion of Puerto Rico has a southeastern coast which goes to the west from Humacao, which roughly defines where the Vieques Passage and the Caribbean Sea meet along the coast. Yabucoa is in the exact southsoutheast area and lies in the 900 region, while Maunabo overlaps the 700's and 900's regions. Vieques, an offshore islandmunicipality, has some highways in the 900 order.
Some roads are numbered using four digits. For example, PR5506. These are branches, or spurs, of tertiary roads by the same last three digit number. Thus, PR5506 is a branch of PR506. They are often dead end branches, and are common in the mountain regions of the main island. Sometimes they are loops branching off the main road and eventually connecting back to the same main tertiary road. The “fourth” digit is generally a repeat of the first digit of the main tertiary road in question. Thus, a branch of PR301 would be signed PR3301, with the added 3 prefixing the number of the main tertiary road associated with the spur, 301, because 3 is the first digit of the main road. When the road has more than one distinct spur, an additional unrelated digit is used (example, PR4301).
This list is incomplete; you can help by adding missing items. 
Number  Length (mi)  Length (km)  Southern or western terminus  Northern or eastern terminus  Formed  Removed  Notes  

PR301  7.1  11.4  Los Morrillos Light in Cabo Rojo  PR101 in Cabo Rojo  —  —  
PR326  2.7  4.3  PR116 in Guánica  PR121 in Yauco  2015  current  Formerly PR1116^{[31]}  
PR339  3.1  5.0  PR105 in Mayagüez  PR119 in Mayagüez  —  —  Part of the Ruta Panorámica  
PR344  4.0  6.4  PR345 in Hormigueros  PR348 in Mayagüez  1953^{[25]}  current  
PR365  —  —  PR368 in Sabana Grande  PR105 in Maricao  —  —  Part of the Ruta Panorámica  
PR366  —  —  PR120 in Sabana Grande  PR365 in Maricao  —  —  Part of the Ruta Panorámica  
PR385  3.29  5.29  PR127 in Peñuelas  PR132 in Peñuelas  1953^{[34]}  current  
PR413  3.8  6.1  PR115 in Rincón  PR115 in Rincón  —  —  
PR435  —  —  PR119 in San Sebastián  PR124 in Lares  —  —  
PR438  1.1  1.8  PR111 in San Sebastián  Barrio Juncal in San Sebastián  —  —  
PR453  —  —  PR1111 in Lares  PR119 in Quebradillas  1953^{[27]}  current  
PR462  1.50  2.41  PR2 / PR463 in Aguadilla  PR110 in Moca  —  —  
PR467  —  —  PR107 in Aguadilla  PR459 in Aguadilla  —  —  
PR487  5.4  8.7  PR129 in Hatillo  PR130 / PR488 in Hatillo  1953^{[32]}  current  
PR500  1.8  2.9  Sector La Cotorra in Ponce  PR132 in Ponce  —  —  
PR501  6.4  10.3  PR123 in Ponce  PR123 in Ponce  —  —  
PR502  3.2  5.1  PR132 in Ponce  PR501 in Ponce  —  —  
PR503  10.6  17.1  Calle Salsa in Ponce  PR143 in Utuado  —  —  
PR504  4.3  6.9  PR10 / PR503 in Ponce  PR505 in Ponce  —  —  
PR505  10.2  16.4  PR139 in Ponce  PR503 in Ponce  —  —  
PR506  1.2  1.9  Urbanización Hacienda Juliana in Ponce  PR14 in Ponce  —  —  
PR507  —  —  Sector Buyones in Ponce  PR1 in Ponce  —  —  
PR510  6.4  10.3  PR1 in Ponce  PR14 in Juana Díaz  —  —  
PR511  11.7  18.8  PR14 in Ponce  PR143 in Ponce  —  —  
PR515  0.93  1.50  PR123 in Ponce  PR10 in Ponce  —  —  
PR516  1.9  3.1  Sector Santas Pascuas in Ponce  PR123 in Ponce  —  —  
PR518  7.5  12.1  PR131 in Adjuntas  PR123 in Adjuntas  1953^{[33]}  current  Part of the Ruta Panorámica  
PR520  —  —  PR391 in Peñuelas  PR502 in Ponce  —  —  
PR525  3.6  5.8  PR135 in Adjuntas  PR131 in Adjuntas  1953^{[33]}  current  Part of the Ruta Panorámica  
PR536  —  —  PR1 / PR537 in Santa Isabel  PR14 in Juana Díaz  1953^{[40]}  current  
PR538  1.1  1.8  Calle Vista Mar in Santa Isabel  PR1 in Santa Isabel  1953^{[40]}  current  
PR549  2.1  3.4  Sector Ranchete in Ponce  PR132 in Ponce  —  —  
PR567  10.1  16.3  PR157 in Orocovis  PR145 / PR6622 in Morovis  1953^{[41]}  current  
PR568  18.7  30.1  PR5155 in Orocovis  PR159 in Corozal  1953^{[47]}  current  
PR577  0.12  0.19  PR143 in Ponce  Cerro Maravilla in Ponce  —  —  
PR578  0.50  0.80  PR1 in Ponce  Calle Húcar in Ponce  —  —  
PR581  —  —  Sector Tiburones in Ponce  PR1 in Ponce  —  —  
PR585  1.7  2.7  PR123 in Ponce  PR2R in Ponce  —  —  
PR588  1.1  1.8  PR504 in Ponce  Camino La Zarza in Ponce  —  —  Spur of PR504  
PR591  1.9  3.1  PR2 in Ponce  PR2 in Ponce  —  —  
PR617  —  —  PR155 / PR618 in Morovis  PR155 / PR159 in Morovis  1953^{[41]}  current  
PR633  2.7  4.3  PR149 in Ciales  PR155 in Morovis  1953^{[41]}  current  
PR642  —  —  PR140 in Florida  PR6685 in Manatí  1953^{[58]}  current  
PR647  8.0  12.9  PR159 / PR5568 in Corozal  PR676 in Vega Alta  1953^{[59]}  current  
PR679  1.7  2.7  PR677 / PR823 in Dorado  PR2 in Dorado  1953^{[60]}  current  
PR690  4.7  7.6  PR676 in Vega Alta  Calle Principal in Vega Alta  1953^{[59]}  current  
PR693  9.6  15.4  PR2 / PR165 in Dorado  PR690 in Vega Alta  1953^{[60]}  current  
PR715  3.5  5.6  Sector Cercadillo in Cayey  PR1 in Cayey  1953^{[21]}  current  Part of the Ruta Panorámica  
PR722  4.8  7.7  PR162 / PR7718 in Aibonito  PR14 in Aibonito  1953^{[45]}  current  Part of the Ruta Panorámica  
PR723  6.0  9.7  PR143 in Coamo  PR14 in Aibonito  1953^{[45]}  current  Ruta Panorámica  
PR735  1.7  2.7  PR1 in Cayey  PR1 in Cayey  1953^{[21]}  current  Part of the Carretera Central  
PR741  —  —  PR15 in Cayey  Barrio Culebras Alto in Cayey  1953^{[21]}  current  Part of the Ruta Panorámica  
PR742  —  —  PR179 in Guayama  PR738 in Cayey  —  —  Part of the Ruta Panorámica  
PR744  1.7  2.7  Sector Central Machete in Guayama  PR3 in Guayama  —  —  
PR760  2.4  3.9  PR3 in Maunabo  Punta Tuna Light in Maunabo  1953^{[61]}  current  Part of the Ruta Panorámica  
PR784  —  —  PR172 in Caguas  PR34 in Caguas  —  —  
PR798  2.9  4.7  PR1 in Caguas  PR1 in San Juan  —  —  Part of the Carretera Central  
PR802  4.1  6.6  PR801 in Corozal  PR152 / PR803 in Naranjito  1953^{[47]}  current  
PR803  6.3  10.1  PR152 / PR802 in Naranjito  PR164 in Corozal  —  —  
PR805  4.5  7.2  PR568 in Corozal  PR803 in Corozal  —  —  
PR806  —  —  PR159 in Corozal  PR823 in Toa Alta  —  —  
PR807  4.3  6.9  PR805 in Corozal  Calle San Manuel in Corozal  —  —  
PR808  —  —  PR803 in Corozal  PR811 in Naranjito  —  —  
PR810  2.3  3.7  PR152 in Naranjito  PR164 in Naranjito  —  —  Formerly PR152  
PR811  —  —  PR152 in Naranjito  PR164 in Naranjito  —  —  
PR818  2.7  4.3  Sector Baja del Palo in Corozal  PR159 in Corozal  1953^{[47]}  current  
PR819  2.6  4.2  PR861 in Toa Alta  PR863 in Toa Baja  —  —  
PR820  —  —  PR677 / PR678 in Vega Alta  PR823 in Toa Alta  1953^{[59]}  current  
PR821  3.7  6.0  PR891 in Corozal  PR630 in Corozal  1953^{[47]}  current  
PR823  4.5  7.2  PR677 / PR679 in Dorado  PR165 in Toa Alta  —  —  
PR862  2.2  3.5  PR861 in Bayamón  PR864 in Bayamón  —  —  
PR863  1.6  2.6  PR2 in Toa Baja  PR862 in Toa Baja  —  —  
PR864  1.3  2.1  PR2 in Bayamón  PR2 in Bayamón  —  —  
PR866  4.8  7.7  PR2 in Toa Baja  PR167 in Toa Baja  —  —  
PR869  2.9  4.7  PR5 in Cataño  PR165 in Cataño  —  —  
PR870  1.3  2.1  PR165 in Toa Baja  Isla de Cabras in Toa Baja  —  —  
PR873  1.1  1.8  PR1 in San Juan  PR1 in San Juan  —  —  Part of the Carretera Central  
PR888  2.2  3.5  PR165 in Cataño  PR5 in Cataño  —  —  
PR891  1.1  1.8  PR159 in Corozal  PR159 in Corozal  —  —  Formerly PR159^{[47]}  
PR901  9.4  15.1  PR760 in Maunabo  PR9910 in Yabucoa  1953^{[61]}  current  Part of the Ruta Panorámica  
PR906  —  —  PR3 in Yabucoa  PR3 in Humacao  1953^{[51]}  current  
PR908  8.4  13.5  PR3 in Yabucoa  PR3 in Humacao  1953^{[62]}  current  
PR939  1.8  2.9  PR760 in Maunabo  Sector Quebrada Arenas in Maunabo  —  —  Part of the Ruta Panorámica  
PR943  —  —  PR189 in Gurabo  PR181 in Gurabo  1953^{[50]}  current  
PR955  3.8  6.1  PR3 in Río Grande  PR3 / PR968 in Río Grande  —  —  
PR983  —  —  PR988 in Luquillo  PR940 in Luquillo  —  —  
PR996  1.3^{[54]}  2.1  PR201 in Vieques  PR201 in Vieques  —  —  
PR998  —  —  Port of Culebra  Zoni Beach in Culebra  —  —  Renumbered to PR250^{[56]}  
PR999  —  —  PR250 in Culebra  Flamenco Beach in Culebra  —  —  Renumbered to PR251^{[56]}  
PR1107  3.9  6.3  PR2 / PR111 in Aguadilla  PR107 in Aguadilla  —  —  Formerly PR111  
PR1111  2.8  4.5  PR111 in Lares  Barrio Lares in Lares  —  —  Formerly PR111; Lares business loop  
PR1116  —  —  PR116 in Guánica  PR121 in Yauco  —  —  Formerly PR116R; renumbered to PR326^{[31]}  
PR1150  —  —  PR5520 in Villalba  PR150 in Coamo  —  —  
PR1181  —  —  PR3 in Patillas  PR3 in Patillas  —  —  
PR3101  0.93  1.50  Calle San Blas in Lajas  PR101 in Lajas  —  —  
PR3108  0.93  1.50  PR2 in Mayagüez  PR108 in Mayagüez  —  —  
PR3116  2.1  3.4  PR116 in Guánica  PR116 in Guánica  —  —  Formerly PR116  
PR3131  3.3  5.3  PR132 in Guayanilla  Sector Malpaso in Peñuelas  —  —  
PR3132  1.4  2.3  PR132 in Peñuelas  PR132 in Peñuelas  —  —  Exists in two segments as the section between PR3384 and PR132 is under construction.  
PR3301  1.8  2.9  Calle Mariana Bracetti in Cabo Rojo  PR301 in Cabo Rojo  —  —  
PR3342  0.68  1.09  PR102 in Mayagüez  PR64 / PR102 in Mayagüez  —  —  Calle Concordia  
PR3344  0.81  1.30  PR309 in Hormigueros  PR344 in Hormigueros  —  —  Hormigueros spur  
PR4010  0.87  1.40  PR110 in Aguadilla  Ramey Air Force Base in Aguadilla  —  —  Formerly PR110R  
PR4025  0.93  1.50  PR110 in Moca  PR110 in Moca  —  —  Formerly PR110R  
PR4110  0.56  0.90  PR443 in Aguadilla  PR110 in Moca  —  —  
PR4111  0.56  0.90  PR111 in San Sebastián  PR111 in San Sebastián  —  —  Formerly PR111  
PR4116  0.93  1.50  PR116 in Guánica  PR333 in Guánica  —  —  Formerly PR116R; Guánica business route  
PR4119  4.5  7.2  PR485 in Quebradillas  PR119 in Camuy  —  —  Formerly PR485  
PR4128  0.75  1.21  PR111 in Lares  PR128 / PR1111 in Lares  —  —  
PR4413  0.62  1.00  PR413 in Rincón  Domes Beach in Rincón  —  —  
PR4415  0.75  1.21  PR417 in Aguada  PR115 in Aguada  —  —  Formerly PR115R  
PR4435  —  —  Quebrada Las Cañas in San Sebastián  PR435 in San Sebastián  —  —  
PR4440  —  —  Parque de Colón in Aguada  PR1107 in Aguadilla  —  —  
PR5139  1.7  2.7  PR14 in Ponce  PR139 / PR139R in Ponce  —  —  
PR5141  1.3  2.1  PR144 in Jayuya  PR141 in Jayuya  —  —  Jayuya northwest bypass  
PR5144  0.47  0.76  PR144 in Jayuya  PR141 in Jayuya  —  —  Jayuya east bypass  
PR5155  0.81  1.30  PR155 in Orocovis  PR155 in Orocovis  —  —  Formerly PR155; Orocovis business route  
PR5156  0.16  0.26  PR155 in Orocovis  PR156 in Orocovis  —  —  
PR5506  0.87  1.40  PR1 in Ponce  PR10 in Ponce  —  —  
PR5510  0.87  1.40  PR1 in Ponce  PR510 in Juana Díaz  —  —  
PR5525  0.68  1.09  Barrio Limaní in Adjuntas  PR525 in Adjuntas  —  —  
PR5538  1.2  1.9  PR538 in Santa Isabel  PR1 / PR5507 in Santa Isabel  —  —  
PR5549  —  —  Barrio Canas Urbano in Ponce  PR2 / PR2R in Ponce  —  —  
PR5561  —  —  PR149 in Villalba  PR150 in Villalba  —  —  
PR5567  1.7  2.7  PR567 in Morovis  Barrio Vaga in Morovis  —  —  
PR5568  2.7  4.3  PR568 in Corozal  PR159 / PR647 in Corozal  —  —  
PR6111  1.7  2.7  PR123 in Utuado  PR111 in Utuado  —  —  Formerly PR111R; Utuado business loop  
PR6140  —  —  PR2 in Barceloneta  PR140 in Barceloneta  —  —  Formerly PR140  
PR6165  0.50  0.80  PR693 in Dorado  PR165 in Dorado  —  —  Dorado business route  
PR6633  0.14  0.23  PR6685 in Ciales  PR149 in Ciales  —  —  
PR6642  —  —  PR642 in Florida  PR140 in Florida  —  —  
PR6685  7.4  11.9  PR146 in Ciales  PR2 in Manatí  —  —  Formerly PR149  
PR6690  1.7  2.7  PR693 in Vega Alta  PR690 in Vega Alta  —  —  
PR6693  0.81  1.30  PR696 in Dorado  PR693 in Dorado  —  —  Dorado southern bypass  
PR7014  —  —  PR14 in Cayey  Calle Enramada in Cayey  —  —  
PR7156  1.7  2.7  PR156 in Aguas Buenas  PR156 in Caguas  —  —  Formerly PR156  
PR7167  —  —  PR156 / PR167 in Comerío  La Plata River in Comerío  —  —  Formerly PR156  
PR7173  0.81  1.30  Sector Las Corujas in Aguas Buenas  PR173 in Aguas Buenas  —  —  
PR7707  —  —  PR3 in Guayama  PR53 in Guayama  —  —  
PR7718  —  —  PR14 in Aibonito  PR162 / PR722 in Aibonito  —  —  Part of the Ruta Panorámica^{[63]}  
PR7722  3.9  6.3  PR722 in Aibonito  PR1 in Cayey  —  —  Part of the Ruta Panorámica  
PR7737  —  —  PR715 in Cayey  PR15 in Cayey  —  —  Part of the Ruta Panorámica  
PR7740  —  —  PR184 in Patillas  PR181 in San Lorenzo  —  —  Part of the Ruta Panorámica  
PR7741  —  —  PR741 in Cayey  PR742 in Guayama  —  —  Ruta Panorámica  
PR7760  1.2  1.9  PR760 in Maunabo  PR901 in Maunabo  —  —  
PR8176  0.87  1.40  PR176 in San Juan  PR176 in San Juan  —  —  
PR8177  0.50  0.80  PR177 in Guaynabo  PR841 in Guaynabo  —  —  
PR8811  —  —  PR164 in Naranjito  Sector Cuchillas Pacheco in Naranjito  —  —  
PR8834  —  —  PR1 / PR173 in Guaynabo  PR1 / PR169 in Guaynabo  —  —  Part of the Carretera Central  
PR8838  —  —  PR177 in San Juan  PR1 in San Juan  —  —  Part of the Carretera Central  
PR8865  —  —  PR165 in Dorado  PR2 in Toa Baja  —  —  
PR8869  1.6  2.6  PR869 in Cataño  PR5 in Cataño  —  —  
PR9030  —  —  PR189 in Gurabo  PR933 in Gurabo  —  —  
PR9185  1.6  2.6  PR185 in Juncos  PR31 in Juncos  —  —  
PR9188  0.68  1.09  PR66 in Canóvanas  PR3 / PR188 in Canóvanas  —  —  
PR9189  0.87  1.40  PR189 in Gurabo  Sector Preciosa in Gurabo  —  —  
PR9918  —  —  PR182 in Yabucoa  PR920 in Yabucoa  —  —  
PR9974  —  —  PR973 / PR9973 in Naguabo  PR978 in Ceiba  —  —  

Interstates
There are no Interstatesigned highways in Puerto Rico, but there are roadways that have received up to 90% of their funding from the US Interstate Highway System.^{[64]} Still, at least as of 2007, none of such highways funded by the Interstate Highway program were planned or built to the standards of the Interstate Highway System.^{[65]} As of March 2001, Puerto Rico had 410 km (250 mi) of such roadways.^{[66]} As of 2001, there were three highways in Puerto Rico funded under the Interstate Highway Program.^{[67]} These routes—such as with Interstate Highways in Alaska and Interstate Highways in Hawaii—do not connect to the Interstate Highway System in the contiguous United States.
Like Interstate routes in Alaska, Puerto Rico Interstate routes are unsigned. For administrative and funding purposes, the three routes have been designated as PRI1, PRI2 and PRI3^{[67]} and run along various combinations of Puerto Rico routes. They do not follow the evenandoddnumber rule used in mainland United States that indicates direction of travel. Per Section 103(c)(1)(B) (ii), Title 23, United States Code (23 U.S.C.) Puerto Rico is exempt from the design standards of Section 109(b).^{[64]}
Puerto Rico's Interstate routes should not be confused with Puerto Rico Routes PR1, PR2, and PR3, which are other major highways in Puerto Rico.^{[68]}
Route  Component routes  Length mi^{[69]} 
Length km 
From  To 

PRI1  PR52 PR18 
71.08  114.39  PR2 in Ponce  PR2 in San Juan (PR22/PR18 interchange) 
PRI2  PR2 PR22 
138.13  222.30  PR1 in Ponce  PR3 in San Juan (PR1/PR26 interchange) 
PRI3  PR53 PR3 PR66 PR26 
40.56  65.27  PR3 in Humacao  PR2 in San Juan (PR1/PR26/PR66 interchange) 
See also
 List of toll roads in the United States § Puerto Rico
 List of highways in Ponce, Puerto Rico
 1953 Puerto Rico highway renumbering
Notes
References
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} ^{f} Autoridad de Carreteras y Transportación (December 22, 2004). "Guias para la Selección e Instalación de Rotulos de Orientacion (Suplemento al MUTCD 2003)" (PDF) (in Spanish). Departamento de Transportación y Obras Públicas. p. 1. Archived from the original (PDF) on November 4, 2009. Retrieved January 5, 2015.
 ^ ^{a} ^{b} Guías para la Selección e Instalación de Rótulos de Orientación (Suplemento al MUTCD 2009). Autoridad de Carreteras. 24 July 2015. pp. 12. Accessed 31 March 2019.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} Autoridad de Carreteras y Transportación Estándares de Ingeniería. "Chapter i: General Design Criteria". Manual de Diseño (PDF) (in Spanish). Departamento de Transportación y Obras Públicas. Sections 103.01, pp. 12. Retrieved January 5, 2015.
 ^ Oscar Voss. "Puerto Rico road photos". Archived from the original on April 4, 2003. Retrieved October 10, 2021.
 ^ "Municipal Ordinance Number 52, Series 20092010. Primera Hora" (PDF) (in Spanish). Autonomous Municipality of Ponce. April 28, 2010. p. 59. Archived from the original (PDF) on 20 July 2011.
 ^ "Oficinas Regionales" (in Spanish). Departamento de Transportación y Obras Públicas. Archived from the original on September 6, 2010. Retrieved 22 August 2010.
 ^ ^{a} ^{b} "ACT Propone Diseño de Mejoras Geometricas Para Agilizar el Transito en las Rampas de Acceso de la PR52 Hacia y Desde Juana Diaz" (Press release) (in Spanish). Departamento de Transportación y Obras Públicas. November 16, 2010. Archived from the original on 24 November 2010. Retrieved 22 November 2010.
 ^ ^{a} ^{b} "Municipio de Ponce Repavimenta la PR2". El Sur a la Vista. Ponce, Puerto Rico (in Spanish). 16 September 2011. Retrieved 19 September 2011.
 ^ ^{a} ^{b} ¿Sabes cómo identificar si una carretera es estatal o municipal? Carlos M. ContrerasAponte, Secretary of the Puerto Rico Department of Transportation and Public Works (DTOP). Departamento de Transportación y Obras Publicas de Puerto Rico. Published 28 August 2017. (Video series name: DTOP en Ruta; Date of video: Unknown). Accessed 2 May 2019.
 ^ "AutoExpreso" (in Spanish). Department of Transportation and Public Works of Puerto Rico. Archived from the original on December 23, 2012. Retrieved December 28, 2012.
 ^ "Tarifas de Estaciones de Peaje" (in Spanish). Department of Transportation and Public Works of Puerto Rico. Retrieved December 28, 2012.
 ^ "Puerto Rico Seeks Prosperity Through Transportation". The New York Times. 29 March 1970. Retrieved 5 September 2019.
 ^ ^{a} ^{b} "Anuncian cierre de carretera por repavimentación". Primera Hora (in Spanish). 4 December 2018. Archived from the original on 24 September 2020. Retrieved 25 April 2022.
 ^ PR2R, Ponce, Puerto Rico PR.Geoview.Info Accessed 3 May 2019.
 ^ "Cabo Rojo, Memoria Núm. 2" (PDF). Puerto Rico Planning Board (in Spanish). 1947. Retrieved August 10, 2020.
 ^ ^{a} ^{b} "Aguadilla, Memoria Núm. 56" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ Inauguran conector con la PR10 del sur.^{[permanent dead link]} Sandra Caquías Cruz. El Nuevo Dia. Guaynabo, Puerto Rico. 14 October 2000. Accessed 15 February 2018
 ^ Listado de Sistemas Viales: Muestra. Departamento de Transportación y Obras Publicas de Puerto Rico. 3 May 2019. Archived at WayBack Machine on 20110206 at 05:23:03AM (6 February 2011). Accessed 3 May 2019.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} ^{f} ^{g} ^{h} Guía de Carreteras Principales, Expresos y Autopistas. Archived 13 October 2018 at the Wayback Machine Gobierno de Puerto Rico. Departamento de Transportación y Obras Publicas. Accessed 3 May 2019.
 ^ Carmelo Rosario Natal. Ponce En Su Historia Moderna: 1945–2002. Published by Secretaría de Cultura y Turismo of the Government of the Autonomous Municipality of Ponce. Ponce, Puerto Rico. 2003. p. 53.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} ^{f} ^{g} "Cayey, Memoria Núm. 42" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} Historia. Departamento de Transportacion y Obras Publicas de Puerto Rico. Archived on 16 February 2009. Retrieved 28 April 2019.
 ^ ^{a} ^{b} ^{c} "Juncos, Memoria Núm. 50" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ "Route 66 Phase 2". Puerto Rico Day Trips. Retrieved February 21, 2020.
 ^ ^{a} ^{b} "Hormigueros, Memoria Núm. 46" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ "Mapa de Calificación de Suelos de Moca" (PDF). Junta de Planificación (in Spanish). Retrieved 12 January 2022.
 ^ ^{a} ^{b} ^{c} ^{d} "Lares, Memoria Núm. 60" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} "Quebradillas, Memoria Núm. 62" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ "Mapa Vial de Aguada" (PDF). Junta de Planificación (in Spanish). Retrieved April 6, 2023.
 ^ "Guánica, Memoria Núm. 44" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} "Abriendo puertas". El Nuevo Día (in Spanish). 2020. Retrieved August 25, 2020.
 ^ ^{a} ^{b} ^{c} "Hatillo, Memoria Núm. 63" (PDF). Puerto Rico Planning Board (in Spanish). 1954. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} ^{d} "Adjuntas, Memoria Núm. 67" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} "Peñuelas, Memoria Núm. 69" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} "Jayuya, Memoria Núm. 68" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ "Resolución para ordenar a la Comisión de Transportación, Infraestructura, y de Recreación y Deportes de la Cámara de Representantes de Puerto Rico, a realizar una investigación sobre las condiciones de la Carretera 142, la cual discurre por los municipios de Dorado, Toa Alta y Corozal, debido a los constantes accidentes automovilísticos en la zona que ponen en peligro la seguridad de los usuarios de dicha vía de rodaje" (PDF). House of Representatives of Puerto Rico (in Spanish). Retrieved May 6, 2019.
 ^ ^{a} ^{b} "Orocovis, Memoria Núm. 47" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} "Villalba, Memoria Núm. 70" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} "Naranjito, Memoria Núm. 53" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} ^{d} "Santa Isabel, Memoria Núm. 40" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} "Morovis, Memoria Núm. 65" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} "Comerío, Memoria Núm. 41" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ "Comunidades impugnarán Ciudadela de Cayey". Centro de Periodismo Investigativo (in Spanish). Retrieved May 4, 2019.
 ^ "Vega Baja, Memoria Núm. 36" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} ^{d} "Aibonito, Memoria Núm. 43" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ Carmelo Rosario Natal. Ponce En Su Historia Moderna: 19452002. Published by Secretaría de Cultura y Turismo of the Government of the Autonomous Municipality of Ponce. Ponce, Puerto Rico. 2003. p. 52.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} ^{f} "Corozal, Memoria Núm. 61" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} "Trujillo Alto, Memoria Núm. 49" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ "Arroyo, Memoria Núm. 37" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} "Gurabo, Memoria Núm. 48" (PDF). Puerto Rico Planning Board (in Spanish). 1954. Retrieved August 11, 2020.
 ^ ^{a} ^{b} "Yabucoa, Memoria Núm. 54" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} "Río Grande, Memoria Núm. 73" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ "Naguabo, Memoria Núm. 76" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} ^{c} ^{d} "Plan Maestro para el Desarrollo Sustentable de Vieques" (PDF). PUERTO RICO Microjuris (in Spanish). 2004. pp. 168–169. Retrieved June 6, 2019.
 ^ "Ponencia del alcalde del municipio de Aguas Buenas, honorable Luis Arroyo Chiqués sobre la resolución del Senado 40 para investigación sobre la paralización del proyecto expreso número 156 que conduce de Caguas a Aguas Buenas" (PDF). Oficina de Servicios Legislativos (in Spanish). Retrieved May 4, 2019.
 ^ ^{a} ^{b} ^{c} ^{d} ^{e} "Plan Maestro para el Desarrollo Sustentable de Culebra" (PDF). PUERTO RICO Microjuris (in Spanish). 2004. p. 142. Retrieved May 4, 2019.
 ^ ^{a} ^{b} "Culebra, Memoria Núm. 75" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved June 6, 2019.
 ^ "Manatí, Memoria Núm. 64" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 11, 2020.
 ^ ^{a} ^{b} ^{c} "Vega Alta, Memoria Núm. 59" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} "Dorado, Memoria Núm. 58" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ ^{a} ^{b} "Maunabo, Memoria Núm. 77" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ "Humacao, Memoria Núm. 52" (PDF). Puerto Rico Planning Board (in Spanish). 1955. Retrieved August 10, 2020.
 ^ Ley Núm. 62 del año 2016 (P. de la C. 2753): Para designar la Carretera Estatal PR7718, parte de la “Ruta Panorámica Luis Muñoz Marín”, en el Barrio Pasto de Aibonito, Puerto Rico, como “Paseo Don Julio Francisco “Paco” Santos Vázquez”. Ley Num. 62 de 17 de junio de 2016. Camara de Representantes de Puerto Rico. LexJuris Puerto Rico. Accessed 2 May 2019.
 ^ ^{a} ^{b} National Highway System: Interstate Highway System: FHWA Route Log and Finder List: Interstate Funding. US Department of Transportation. National Highway Administration. Accessed 2 May 2019.
 ^ FHWA Route Log and Finder List: Additional Designations. Tony DeSimone. U.S. Federal Highway Administration. 22 March 2007. 2 May 2019.
 ^ "Section D: Puerto Rico Highways" (PDF). Latin America Trade and Transportation Study. Mississippi Department of Transportation. March 2001. Archived from the original (PDF) on 6 March 2012. Retrieved 23 September 2010.
 ^ ^{a} ^{b} DeSimone, Tony (April 6, 2011). "Table 3: Interstate Routes in Each of the 50 States, District of Columbia, and Puerto Rico". Route Log and Finder List. Federal Highway Administration. Retrieved July 4, 2012.
 ^ "National Highway System  Puerto Rico Map" (PDF). U.S. Federal Highway Administration. Retrieved 21 February 2019.
 ^ "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002". Route Log and Finder List. Federal Highway Administration. June 4, 2012. Retrieved July 4, 2012.