Truck bypass

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A labeled aerial photograph of the Newhall Pass Interchange showing significant geographic separation between the standard freeway route (blue and green) and the dedicated truck bypass (red).

A truck bypass is a roadway that provides physical separation of trucks from passenger vehicles at a freeway interchange in order to eliminate weaving between passenger cars traveling at higher speeds and trucks traveling at lower speeds.[1] Typically a truck bypass exits the main freeway some distance before the interchange it is intended to bypass; trucks are usually required to use the bypass, while passenger cars may choose between the bypass and the main traffic lanes. A truck bypass may take the form of a dedicated roadway or a collector/distributor road. The bypass allows vehicles traveling on it to exit the interchange in the same possible directions as the main line of traffic, and then merges with the respective freeway at some point past the interchange.

Truck bypass should not be confused with truck lane; a truck lane is a lane dedicated for trucks on steep inclines that is not physically separated from the main highway.

Notable Examples

United States



Commercial Vehicle Lane Project on Interstate 75 from I-475 north of Macon to SR 20 near McDonough (construction to begin in 2024 with a 2028 completion date)[2]

New Jersey


  • Interstate 5 (northbound only) after exit #294 to Barbur Boulevard (northern terminus of OR 99W) in Portland[3]

See also


  1. ^ "SANBAG: Interchange projects". 2009-06-04. Archived from the original on 4 June 2009. Retrieved 2022-08-21.
  2. ^ Richardson, Bre'onna (2020-12-02). "'Construction to begin in 2024': Georgia planning truck-only interstate lanes". WMAZ-TV. Retrieved 2023-03-09.
  3. ^ Google (October 2022). "I-5 Truck Lane in Portland, Oregon". Google Street View. Google. Retrieved March 9, 2023. {{cite web}}: |author= has generic name (help)