A is a Freeway with only one Lane in each direction, and usually no Median Barrier . It may be built that way because of Constraint s, or may be intended for expansion once traffic volumes rise. The term Super Two is often used by Roadgeek s for this type of road, but Traffic Engineer s use that term for a high-quality surface road.
A somewhat related concept is a . This is much rarer.
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.
- In Melbourne, Victoria, Australia the Mornington Peninsula Freeway , Metro 11, is a two-lane freeway between the interchange with Jetty Road and the interchange with Boneo Road.
- In a few Europe an 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.
- 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.
- The Bert T. Combs Mountain Parkway in Kentucky is a two-lane freeway from Exit 43 at Campton to the road's eastern terminus in Salyersville .
- US 6 on Cape Cod , Massachusetts , from exit 9 (MA 134) in Dennis to the Orleans Rotary . This stretch of highway is known to locals as "Suicide Alley" due to the high number of fatalities from Head-on Collisions . Median construction has alleviated this problem somewhat.
- Massachusetts Route 2 , from Millers Falls to the eastern US 202 interchange in Phillipston , with a small gap in Ervingside .
- See List Of Expressways In Michigan for two-lane freeways in the state of Michigan .
- New Hampshire Route 101 from Milford to Amherst and again from Exit 13 ( NH 27 ) in Hampton to Highland Ave. at Hampton Beach .
- In New Hampshire , Interstate 93 ("Franconia Notch Parkway") from Woodstock to Franconia due to fears that blasting out a 4-lane highway would de-stabilize the Old Man Of The Mountain . This was constructed with a median divider. However, the Old Man of the Mountain has already been destroyed by another cause as of 2003 .
- New Hampshire Spaulding Turnpike from Rochester to Milton .
- 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 . Also, in 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), and pieces near Port Angeles, Washington .
- 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 2 more exits on this section of Route 7. Exit 3 serves VT 7A in the Arlington, Vermont Area. And Exit 4 Serves VT Routes 30 and 11 for Manchester, Vermont
- The West Virginia Turnpike was a two-lane freeway from its opening in 1954 until it was expanded to four lanes in 1986 .
- Maryland State Highway 90 is mostly a two-lane freeway (it has 1 Traffic Signal )
- Florida State Road 570 , Polk Parkway, is a two-lane freeway along its northernmost six miles. This is an example of a two-lane Toll Road .
- A section of Texas State Highway 19 east of Huntsville is a two-lane freeway.
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