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Pennsylvania Turnpike

Pennsylvania Turnpike

Pennsylvania Turnpike


With thousands of daily travelers, the Pennsylvania Turnpike requires a continuous partner to help maintain and keep the roadway at top efficiency.

Services Involved

  • Alignment Studies
  • Bridge Analysis and Design
  • Design/Build
  • Environmental Assessment and Planning
  • Erosion and Sediment Control
  • Hydrologic and Hydraulic Modeling and Design
  • Intelligent Transportation Services
  • Interchange Justification Studies
  • Lighting Design
  • Limited Access and Highway Design
  • Project Management and Scheduling
  • Public Involvement Management and Coordination
  • Surveying and GPS
  • Toll Facilities
  • Traffic Control and Maintenance Plans
  • Wetland Permitting and Mitigation


Outstanding Highway Design Award: Mon-Fayette Expressway

American Society of Highway Engineers (ASHE), Pittsburgh Chapter

Pennsylvania Turnpike

The Pennsylvania Turnpike is recognized as the first American “superhighway.” With a design patterned after Germany’s 100-mph autobahns of the day, it officially entered service on October 1, 1940.


Initially started to cut the travel time between Harrisburg and Pittsburgh, the project limits were from Middlesex, located west of Harrisburg, to Irwin, east of Pittsburgh, a distance of 160 miles. Today’s turnpike has become a highway stretching 514 miles across the state and an integral part of the nation’s interstate system, which was begun in the 1950s under the Eisenhower Administration.


For almost 30 years, the Pennsylvania Turnpike Commission (PTC) has turned to ms consultants for fast-tracked, comprehensive transportation studies and design engineering services. ms has helped the PTC maintain and improve the turnpike for the thousands of vehicles that use it each day.


ms first began working on Pennsylvania Turnpike projects in 1990 with the rehabilitation of two bridges in Fulton County, located in the south-central part of the state.


Since that time, the firm has provided comprehensive engineering services for various improvements to the turnpike.




One of the largest projects ms has been involved in was the Mon-Fayette Expressway. This 17-mile, $475 million segment of toll road extends from I-70 in Washington County north to S.R. 51 in southern Allegheny County. ms was responsible for numerous tasks, including the preliminary plan preparation of 11,300 feet of the expressway; 13,000 feet of ramps at a diamond interchange; 2,700 feet of side road construction; nine new bridges and culverts that included two dual mainline bridges and a prestressed concrete circular pipe; stormwater plans; erosion and sediment pollution control plans; highway lighting plans; pavement marking plans; and traffic control plans.


ms also worked as a subconsultant to the FIGG Engineering Group on the Allegheny River Bridge replacement project, a complex project that required highway, structure, traffic and environmental services.


The associated roadway approach work encompasses a 1.8 mile section of the Pennsylvania Turnpike mainline between milepost 47.2 and 49.0. This section was widened to six lanes with minor realignment, phased such that traffic was maintained at all times. Included in the improvements was the reconfiguration of the Allegheny Valley Interchange ramps.




ms is also responsible for the design of the $113+ million total reconstruction of seven miles of turnpike mainline between milepost 31.0 and 38.0, which includes widening the existing 10-foot median to a 50-foot median to accommodate two additional lanes. Included in the widening effort are improvements to nonstandard horizontal and vertical curves and improvements for the eastern portion of the Warrendale Toll Plaza.


This project also encompassed the replacement of four overhead bridges and the replacement/widening of all mainline structures, retaining walls, stormwater management, drainage, traffic control for phased construction, right-of-way acquisition and construction services.




The I-95/I-276 Interchange project in Bucks County, PA is part of a project undertaken by the PTC to make a direct connection between I-95 and I-276. This section is unique in that it is the only one within the project that is entirely outside the turnpike system, requiring coordination efforts with PennDOT Engineering District 6-0.

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