Template:Main Page/Historic byways/December

• Dec. 1, 1954 – Over one thousand people join a caravan to drive the first 22 miles (35 km) of the Ohio Turnpike to open for traffic.
• Dec. 2, 2014 – The eastern quarter of the Inner Loop in Rochester, New York, was closed as part of a $21 million freeway removal project.
• Dec. 3, 1971 – The American Association of State Highway Officials approves the removal of the U.S. Route 611 designation.
• Dec. 3, 2012 – The U.S. Route 202 parkway between Montgomeryville and Doylestown, Pennsylvania opens to traffic
• Dec. 4, 1971 – Highway 427 is designated in Toronto.
• Dec. 5, 1984 – U.S. Route 75 between Omaha, Nebraska, and Sioux City, Iowa, is removed from Interstate 29 in Iowa and re-routed along the former U.S. Route 73 and existing U.S. Route 77 corridors.
• Dec. 6, 1967 – A groundbreaking ceremony is held in Lyon County, Kentucky, to celebrate the forthcoming construction of the first section Interstate 24 in the state.
• Dec. 7, 1959 – Forty-five miles (72 km) of Interstate 94 that connect Paw Paw and Battle Creek, Michigan, were dedicated.
• Dec. 8, 1941 – The Japanese attack on Pearl Harbor provides the impetus to complete sooner the Anton Anderson Memorial Tunnel (western portal pictured) along the Portage Glacier Highway.
• Dec. 9, 1944 – The Suitland Parkway, then called the Camp Springs Highway, is opened completely to traffic in Washington, D.C., and Maryland.
• Dec. 10, 1949 – The Parliament of Canada passes the Trans-Canada Highway Act.

• Dec. 11, 2010 – Open road tolling begins on the Dallas North Tollway.
• Dec. 12, 1962 – Except for portions through Detroit, Interstate 96 (pictured) opens across the state of Michigan.
• Dec. 13, 1966 – Interstate 80N, later Interstate 680 and now Interstate 880, opens to traffic in Iowa.
• Dec. 14, 1989 – The Enchanted Circle Scenic Byway through northern New Mexico is designated a National Forest Scenic Byway.
• Dec. 15, 1967 – The Silver Bridge, which carries U.S. Route 35 over the Ohio River between West Virginia and Ohio, collapses killing 46 people with only five survivors rescued. Its replacement opens two years later to the day.
• Dec. 16, 2019 – Lanes are reconfigured on the Alex Fraser Bridge carrying British Columbia Highway 91 over the Fraser River in Delta to add a seventh and reversible zipper lane.
• Dec. 17, 1988 – Interstate 370 opens in Gaithersburg, Maryland.
• Dec. 18, 2000 – The Oklahoma Turnpike Authority begins collecting tolls at noon on the new western extension of the Creek Turnpike.
• Dec. 19, 1958 – The governor of Arizona dedicates the Mule Pass Tunnel along U.S. Route 80 near Bisbee.
• Dec. 19, 2000 – The Puncheon Run Connector freeway in Dover, Delaware opens to traffic
• Dec. 20, 2018 – A portion of California State Route 134 is designated the "President Barack H. Obama Highway".
• Dec. 21, 1979 – Construction is completed on the Governor Edwin C. Johnson bore for eastbound Interstate 70 over the Continental Divide in Colorado

• Dec. 21, 1979 – Construction is completed on the Governor Edwin C. Johnson bore for eastbound Interstate 70 over the Continental Divide in Colorado
• Dec. 21, 1993 – The Delaware Route 1 toll road opens between Dover Air Force Base and Smyrna
• Dec. 22, 1989 – The recently completed Interstate 355, also known as the North–South Tollway, is dedicated by Governor James R. Thompson and U.S. Secretary of Transportation Samuel K. Skinner between Bolingbrook and Itasca, Illinois.
• Dec. 23, 1964 – Construction on the last segment of the Brooklyn–Queens Expressway, also known as Interstate 278, is completed in New York City.
• Dec. 24, 1959 – The newly constructed extension of Ontario Highway 401 between Barrie to Coldwater, is opened to traffic as a super two.
• Dec. 25, 1998 – A ruling by the Montana Supreme Court against speeding enforcement tactics used by the Montana Highway Patrol brings an end to the lack of numbered speed limits on Montana's state highways (pictured).
• Dec. 26, 1980 – Severe flooding of the Stillaguamish River leads to the closure of Washington State Route 530 to traffic between Stanwood and Silvana.
• Dec. 27, 1950 – Construction begins on the first section of Arizona State Route 84A (now Interstate 10) in Tucson, with the intended purpose of redirecting truck traffic away from the city's core.
• Dec. 28, 1955 – The Pennsylvania Turnpike Northeast Extension opens between US 22 near Allentown and a temporary interchange in Emerald
• Dec. 28, 1961 – The Woodrow Wilson Bridge is opened to traffic across the Potomac River between Alexandria, Virginia and Oxon Hill, Maryland in the Washington, D.C. metropolitan area.
• Dec. 29, 1955 – A marker is installed on Utah State Route 187 (now State Route 287), identifying the route as state's shortest designated highway.
• Dec. 30, 1940 – The remainder of the Arroyo Seco Parkway being constructed in Los Angeles, California between Avenue 40 and Avenue 22, is completed and opened to traffic, in time for the Rose Bowl and Tournament of Roses Parade the next day.
• Dec. 31, 1985 – The Connecticut Turnpike is officially renamed the Governor John Davis Lodge Turnpike after the recently deceased former state governor.