Highway 410 in Ontario was originally a super-2 before being upgraded to a full freeway. 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. At-grade intersections exist but there is sufficient land to replace them with interchanges. 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 carriageway. Ī 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. 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. When upgraded in this manner, the road becomes a typical freeway. 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. 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. According to this same regulation "High-quality roads shall be specially designed and built for motor traffic, and shall be either motorways, express roads or conventional strategic roads." Some European union regulation considers the high-quality roads to be roads "which play an important role in long-distance freight and passenger traffic, integrate the main urban and economic centres, interconnect with other transport modes and link mountainous, remote, landlocked and peripheral NUTS 2 regions to central regions of the Union". These roads are usually, but not always, reserved for motorized vehicles, and accessible with limited-access roads (see Voie rapide). This type of road is not very standardized, and its geometry may vary from country to country or within a same country. This concept is recognized both by European Union law and under the UNECE treaty. ![]() In Europe, the concept of express road encompasses roads which are classified between a motorway and an ordinary road. Route 101 in California through Humboldt Redwoods State Park. This is much rarer a current example is U.S. Most of these roads are not tolled.Ī somewhat related concept is a "four-lane undivided freeway". 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. It may be built that way because of constraints, or may be intended for expansion once traffic volumes rise. The Plimoth Plantation Highway in Massachusetts is a two-lane expressway.Ī two-lane expressway or two-lane freeway is an expressway or freeway with only one lane in each direction, and usually no median barrier.
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