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Golden Mile Continuous Green T Intersection

Murrysville, PA

Client

EQT and PennDOT District 3-0

Services

  • Roadway Design

Stahl Sheaffer provided planning, design, and geotechnical services for the privately funded redesign and realignment of the intersection at the junction of traffic routes 286 & 380 (Golden Mile Highway & Saltsburg Road) in Murrysville, Pennsylvania, a complicated intersection with unique geometry. After a study determined that the intersection needed to be signalized, Stahl Sheaffer explored various alternatives to ensure the safest solution. A collaborative effort between Stahl Sheaffer, PennDOT, Municipality of Murrysville officials, municipal engineer, and other stakeholders ultimately ensured a successful project. A design was recommended that allows the major direction of traffic on the main road to bypass the traffic signal and flow continuously, while other movements (such as left turns from Saltsburg Road) are managed by a traffic signal and channelized lanes. The continuous flow aims to improve traffic efficiency, reduce delays and fuel consumption, and enhance safety by minimizing potential angle crashes. Stahl Sheaffer designed a “Continuous Green T (CGT) Intersection” whereby the major direction of traffic traveling straight through the intersection flows continuously without stopping, while other movements are managed by a traffic signal and channelized lanes. CGT intersections have been successfully used in Pennsylvania and many other states. The corridor along the Golden Mile Highway presented unique challenges with regard to two major traffic routes intersecting and bound tightly by existing land uses, terrain, highway structures, and access points. Applying a CGT intersection opposite an access break is difficult to achieve without re-location. Stahl Sheaffer worked with PennDOT to arrange a design that still accommodated the existing access point, maintained traffic during construction, and successfully applied an innovative CGT intersection to this location.

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