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Memorial Parkway (Huntsville)
Memorial Parkway, also known as The Parkway, is a major thoroughfare in Huntsville, Alabama〔 that carries over 100,000 vehicles on average a day.〔 It, in whole or in part, follows U.S. Route 231, U.S. Route 431, U.S. Route 72, and State Route 53 through the Huntsville city limits.〔 It is a limited access road through most of Huntsville city proper, providing exits to the frontage road which allow access to road intersections, as well as businesses and residences along the route.〔 Both the limited access and frontage roads are referred to as Memorial Parkway. Originally constructed in the 1950s and officially opened on December 1, 1955, the highway is the major commercial thoroughfare through Huntsville, a status it has held since the mid-1960s.〔〔〔
==General Plan and Structure==
The limited access portions of the Parkway contain eight lanes of traffic; in each direction there are two lanes of limited-access traffic, paralleled by a two-lane, one-way frontage road. At major intersections, the four limited-access lanes overpass the intersecting road with a "camel back" type overpass, while the frontage roads have a signal-controlled intersection with the intersecting road. At each overpass, there is a pair of turn lanes that permit traffic on the frontage roads to make U-turns between the northbound and southbound frontage roads without having to go through the signalized intersection. Generally, in between overpasses, there exists a pair of entrance and exit ramps that allow traffic to transition between the limited-access lanes and the parallel frontage road. Other than at intersections with overpasses, traffic on the frontage road always has the right of way vs. intersecting streets and driveways and there are no other traffic signals. The frontage roads do not exist between the University Drive and Clinton Avenue overpasses; here through traffic must merge into the limited-access lanes.
There are two intersections where the Parkway crosses under the intersecting road, at Martin Road and Interstate 565. Currently the frontage roads end at Martin Road because a non-limited access portion still exists between it and the Whitesburg Drive overpass. It is not currently known how the frontage access will be structured at Martin Road once the non-limited access portion to its south is improved, or whether U-turn lanes for the frontage will be possible. At the I-565 interchange, it is possible for Parkway traffic to make a U-turn by executing a sequence of ramp lane changes, although no signage indicates this.
Most of the non-limited access portions within the Huntsville city limits consists of six through lanes, three in each direction, separated by a median. There are no frontage roads on these portions. Most of the portion north of the Mastin Lake Road intersection consists of four lanes, two in each direction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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