Two-lane expressway: Wikis


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A two-lane expressway is an 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. Most of these roads are not tolled.

A somewhat related concept is a four-lane undivided expressway. This is much rarer; an example is some sections of U.S. Route 101 in northern California.



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.

A super-2 expressway is a high-speed surface road with at-grade intersections, depending on the common usage of the term expressway in the area. By this definition, Super-2s can be considered the first stage of project which is expected to become a full freeway, with the transportation authority owning the land necessary for the future adjacent carraigeway. At-grade intersections exist but there is sufficient land to replace them with interchanges. In some US states, a super-2 expressway is simply referred to as a super-2, regardless of whether it is fully controlled-access or not.

When an undivided freeway has four lanes, it is known as a super-4, though these are an oddity as most multi-lane freeways are divided, due to potential accidents from high-speed traffic crossing to the opposing side. Highway 27 directly north of Highway 401 in Toronto, Ontario is an example of a super-4 freeway by this definition, as it has four lanes of undivided traffic, and is fully controlled-access with interchanges and service roads to provide access to property in the area.

A super-4 expressway is a multi-lane divided highway with at-grade intersections, although the highway will become a full controlled-access freeway if the intersections are replaced with interchanges. A super-4 may have formerly been a super-2 that has been twinned, although such instances of super-4 intermediaries are rare as super-2s are often upgraded right away to full freeways. Highway 40 in Ontario is a super-4 expressway between Highway 402 and Wellington St., and from Indian Rd to Courtright. The remaining sections of Highway 40 are super-2 expressways. Other super-4 expressways include the Hanlon Parkway in Guelph and the Black Creek Drive in Toronto, both which have sufficient right of way to allow for interchanges and overpasses to replace the at-grade crossings.

List of two-lane freeways



New Zealand

  • Linking the cities of Napier and Hastings is the two-laned Napier - Hastings Motorway.
  • Christchurch
    • In the Southwestern part of the City is the two-Laned Christchurch Southern Arterial Motorway. This will be duplicated to four lanes in 2012-2014.
    • Linking Christchurch with Lyttelton is the Limited-Access Tunnel Road.
  • Dunedin
    • The main northern access road into Dunedin is the Dunedin Northern Motorway, which winds through rough and at times unstable terrain. Much of this road is two-laned, though passing lanes exist on many of the steeper uphill sections.
    • The city's main southern access road, the Dunedin Southern Motorway, also has a short one-kilometre section which is only two-laned.


  • In a few European countries (like Germany and 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.
  • In Croatia, the Istrian Y highway complex used to consist out of two-lane freeways, which were due to be upgraded to four-lane ones, should the traffic increase. The complex is currently classified as consisting of expressways and as such has a general speed limit of 110 km/h (68 mph), although a limit of 100 km/h (62 mph) tends to be more prevalent there. However, as the traffic increases came sooner than it was predicted, the status of Istrian Y was changed to semi-highway, as a widening to four or six lanes is already in progress.
  • Highway 19 in the Czech Republic is a 2-lane expressway between Highway 3 and Zahradka.

United Kingdom

  • The former A6144(M) in Manchester had one lane in each direction, although to Motorway standards. It has now been downgraded to an A road.
  • The A601(M) road in Lancashire is a two-lane freeway between its junction with the M6 and terminus at the B6254.
  • The Runcorn Spur Road in Runcorn, United Kingdom is a 2-lane expressway with grade separations and at-grade intersections (partially motorway-like).

South Africa

Some sections of two lane freeway can be found on the N1 and the N2 highways.

South Korea

The 88 Olympic Expressway, Route 12, is a two-lane limited access tollway for 144 of its 183 kilometers, between exits 14 (Danyang) and 26 (East Dongguryeong). It is fully integrated into South Korea's ticketed tollway system. This section is to be widened to four lanes by 2015.

North America



  • 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.
  • A Super-2 toll road, MEX-150D and MEX-190D(MEX-150D travels to Veracruz), also connects Mexico City and Oaxaca.
  • 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.
  • A Super-2 toll road (MEX-15D) connects most of the distance between Mazatlán and Tepic.

United States

  • The Truckee Bypass, the current routing of California State Route 267, is a two-lane expressway with provisions to be upgraded to 4 lanes in the future.
  • A 1-mile (1.6 km) portion of the Milford Connector from the Wilbur Cross Parkway to Wheelers Farms Road in Milford. This divided 2-lane extension of the original connector opened in 1993.
  • Route 190 between Route 159 in Suffield and the Pearl Street underpass in Enfield is a two-lane undivided freeway. It was originally planned to be a 4-lane expressway across northern Connecticut.
  • Route 2A from the eastbound on-ramp from Mohegan Boulevard to Route 12 (0.8 miles).

US-400 bypasses Neodesha to the south and west. The western portion of this bypass is two-lanes, while the eastern section, multiplexed with US-75 is a conventional 4-lane freeway.

  • The Hal Rogers Parkway (formerly Daniel Boone Parkway), connecting Hazard and London, is a two-lane freeway for virtually its entire length (approximately 65 miles), with occasional truck lanes on hills. The only four-lane section is the northern bypass of London at the road's western end. Originally, the road was tolled from the eastern end of the London bypass to Hazard. May be upgraded to four lanes in the future as part of a possible extension to Interstate 66.
  • 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.
New Hampshire
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.
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.
  • NY 104 has two-lane freeway sections between Rochester and Oswego. It was originally intended to become a freeway, but only one set of lanes were built.
North Carolina
US 33 in southeast Ohio
  • U.S. Route 101, from the southern edge of Cannon Beach, Oregon north to the interchange with U.S. Highway 26 south of Seaside, Oregon.
  • Oregon Route 22 is a four-lane undivided freeway from Salem east to just north of Aumsville. It becomes a true freeway for about 5 miles through Stayton/Sublimity, then is a two-lane freeway for about another mile east. (The freeway section between Aumsville and Stayton was, until recently, a two-lane freeway itself.)
  • U.S. Route 220, south of the Bedford Fairgrounds interchange to the intersection with Business Route 220.
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.
  • 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 originally planned.
  • The Bennington Bypass will be a 2-lane bypass of Bennington when completed. One segment from US-7 to New York Route 7 is open and signed as Route 279. The remaining portions of the bypass, yet to be built, will be signed as US-7 when construction is completed.
  • 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 State Route 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.
  • U.S. Route 301 in southern Virginia where it parallels Interstate 95. It was originally wider before the construction of I-95.
  • U.S. Route 101 from the interchange with Washington State Route 3 to the northern city limits of Shelton (half-freeway with two-way traffic on northbound side and no plans for the southbound half being constructed), and a section between Sequim, Washington and Port Angeles, Washington (half-freeway with two-way traffic on the eastbound side, with some intersection segments upgraded to full freeway and plans for further improvements.)
West Virginia
  • The West Virginia Turnpike was a two-lane freeway from its opening in 1954 until it was expanded to four lanes in 1986.
  • U.S. Highway 14, south of the interchange with County MM at Oregon, to Wisconsin 138. This section is slated to be expanded to four-lanes in the near future.
  • Wisconsin 26 bypass of Fort Atkinson
  • The U.S. Highway 151 bypasses of Beaver Dam and Waupun were originally built as Super-2s during the 1970s to accommodate future expansion; these have since been upgraded as part of the highway's ongoing conversion to a four-lane facility through the entire state.
  • Portions of Interstate 39 / U.S. Highway 51, first near Westfield and later near Tomahawk, were built as a two-lane freeways; these were expanded in the late 1980s and 1990s respectively.
  • WI 35/65 on the River Falls Bypass from WI 29 to when the four-lane starts.



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