Fort Washington Interchange No. 26
The project involved the design of an additional deceleration lane to provide two lanes of exiting eastbound traffic at the Fort Washington Interchange, No. 26 in Montgomery County. During peak traffic periods, the eastbound exiting traffic would stack from the tollbooths through the interchange area and on to the mainline roadway. This condition dictated a capacity improvement project to eliminate stopped vehicles on the mainline travel lanes of the Turnpike. The existing deceleration ramp was extended along the mainline to gain additional capacity and the new lane built adjacent from the mainline to the toll collection facility. This required a shift of the median barrier separating the eastbound exiting and eastbound entering traffic through the interchange area and across two structures. Widening of the westbound exit and entrance ramps were also required to provide adequate room for the additional eastbound exit ramp land to the toll booth area.
Required services included field surveys, detailed interchange geometrics, super-elevation transitions, drainage design and update, milling, widening, and resurfacing existing ramps throughout the interchange area, new guide rail design, structure modifications, bridge approach slabs, detailed traffic staging plans, signing and pavement marking plans, and construction documents. Project schedule was critical as this was the initial project in a series of projects being undertaken by the Turnpike Commission and the Pennsylvania Department of Transportation on Route 309 adjacent to the project area.
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