Two-lane freeway

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A two-lane freeway or two-lane expressway is a freeway or expressway with only one lane in each direction, and usually no median barrier. It may be built that way because of constraints, or may be intended for expansion once traffic volumes rise. The term super two is often used by roadgeeks for this type of road, but traffic engineers use that term for a high-quality surface road.

A somewhat related concept is a four-lane undivided freeway. This is much rarer.

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[edit] Justification

Two-lane freeways are usually built as a temporary solution due to lack of funds, as an environmental compromise or as a way to overcome problems constrained from highway reconstruction when there are four lanes or more. If the road is widened, the existing road is typically allocated to traffic going in one direction, and the lanes for the other direction are built as a whole new roadbed adjacent to the existing one. When upgraded in this manner, the road becomes a typical freeway. Many two-lane freeways are built so that when the road is upgraded to a proper divided freeway, the existing overpasses and ramps do not need reconstruction.

[edit] List of two-lane freeways

[edit] Australia

[edit] Europe

  • In a few European countries (like Switzerland), many rural highways have been converted into two-lane freeways. However, most of these have been built with low overpasses wide enough to accommodate only 2 lanes, which indicates that there is no intent to widen them into freeways in the foreseeable future. In German this type of road is called an Autostrasse.
  • Sections of the A9 between Perth and Inverness in the United Kingdom.
  • The former A6144(M) in Manchester had one lane in each direction, although to Motorway standards. It has now been downgraded.

[edit] North America

[edit] Canada

[edit] Mexico

  • A new Super-2 bypass of Mexicali (MEX-2D) was completed in Summer 2006. It features 1 lane in each direction and is a toll road. Three interchanges exist--one at each end, and one in the middle, providing access to MEX-5 (north to Downtown Mexicali and south to San Felipe). The road has complete control of access. According to a toll collector, this Super-2 is scheduled for an upgrade to a full toll freeway (four lanes, two in each direction) by sometime in 2008. Eventually, this freeway may be constructed all the way to San Luis Rio Colorado, replacing the existing four lane undivided highway, MEX-2.
  • Apparently, a Super-2 toll road also connects Mexico City and Oaxaca (route number unknown).
  • A Super-2 bypass of Poza Rica, Veracruz, was finished in 2005. This two-lane toll highway connects MEX 131 north of Poza Rica to MEX 180 east of Papantla.

[edit] United States

[edit] Connecticut

Route 2A from I-395 to Route 2, serving as a bypass to the city of Norwich. There are plans to add a second carriageway, upgrading Route 2A to a 4-lane expressway, including the construction of a parallel span across the Thames River. The Mohegan Sun Casino is located adjacent to Route 2A.

[edit] Florida

[edit] Kentucky

[edit] Maine
  • Interstate 95 North of Bangor, Maine was originally constructed as a two-lane freeway. In 1981 the present divided highway was completed between Bangor and Houlton at the Canadian border.

[edit] Maryland

[edit] Massachusetts

[edit] Michigan

[edit] Minnesota
  • US 12 bypass around Long Lake, under construction, though funding constraints have reduced the length that will be considered freeway.

[edit] New Hampshire

[edit] New Jersey
  • The Freehold Bypass of Route 33 is a two-lane freeway between Halls Mill Road (CR 55)and Brickyard Road. There is a full cloverleaf at Halls Mill, a westbound entrance at Howell Road, and full access from Brickyard Road.

[edit] New York
  • An example of a two-lane parkway is Bethpage State Parkway, on Long Island, NY. This was constructed by Robert Moses as a two-lane freeway in part due to aesthetics. Like most parkways (especially those created by Moses), the road was originally meant to deliver a pleasurable motoring experience, and as such incorporates natural scenery, as well as pedestrian and bicycle trails for those who choose not to drive.

[edit] North Carolina

[edit] Oregon

[edit] Rhode Island
  • Route 78, which starts about 200 yards (meters) inside Connecticut bypasses the city of Westerly to the north and east, and is a key route for traffic heading between I-95 and the Rhode Island beaches.

[edit] Texas
  • A section of State Highway 19 east of Huntsville is a two-lane freeway.
  • Most of Loop 322 in Abilene was once a two-lane freeway, but construction is underway that will expand the entire loop to a standard four-lane freeway.

[edit] Vermont
  • US 7 just north of Bennington, Vermont to just north of Manchester, Vermont is a full expressway that turns into a two-lane freeway just after Exit 2 (VT 7A). There are two more exits on this section of Route 7. Exit 3 serves VT 7A in the Arlington area, and Exit 4 serves VT Routes 30 and 11 for Manchester.
  • Route 289, which was once planned as Interstate 289, around Burlington. There are plans to extend the Super-2 both north and south, and current mile markers are based upon the entire length as originaly planned.

[edit] Virginia
  • The Danville Bypass, (U.S. Highway 29) was originally constructed as a two-lane freeway.
  • The Warrenton Bypass portion of U.S. Highway 29 was originally constructed as a two-lane freeway. It has since been upgraded to a divided highway.
  • The Staunton Loop Road (Virginia Highway 262) is a two-lane freeway for most of its length. Grading already exists for this highway to be upgraded to a fully divided highway in the future.
  • U.S. Highway 501 in Lynchburg.
  • U.S. Highway 17 Where it bypasses Fredericksburg.

[edit] Washington
  • From the interchange with SR 3 to the northern city limits of Shelton (half freeway with 2 way traffic on northbound side and no plans for the southbound half being constructed).
  • Pieces near Port Angeles, Washington.

[edit] West Virginia

[edit] See also

  • Autostrasse - the German equivalent of a two-lane freeway