The I‑78 toll bridge over the Delaware River is the most heavily traveled bridge operated by the Delaware River Joint Toll Bridge Commission, serving as a critical connection between Pennsylvania and New Jersey. To enhance safety, reliability and traveler comfort along this vital corridor, STV provided design and engineering services for parapet and roadway upgrades along a 2.25‑mile segment in Northampton County, Pennsylvania. The work also included multiple structures along the corridor, such as spans over SR 0611, SR 0519, Ramp C and improvements near the Pennsylvania Welcome Center.
What challenges did STV address?
The existing corridor required a comprehensive review of structures, safety systems, and utilities to ensure compliance with Pennsylvania Department of Transportation (PennDOT), New Jersey Department of Transportation (NJDOT) and AASHTO standards. STV evaluated guide rails, noise barriers, lighting systems and utilities to determine upgrade needs. The team also conducted ramp and bridge inspections while assessing constructability to maintain traffic along one of the region’s busiest interstate crossings.
What solutions did STV deliver?
STV performed a concept study, detailed inspections and coordinated utilities to support safer, more resilient bridge and roadway operations. The team developed design recommendations for parapet upgrades, lighting and barrier enhancements and provided constructability reviews to ensure efficient and safe construction staging. STV’s work supported the Commission’s larger effort to modernize infrastructure across the I‑78 corridor.
How does this project benefit the community?
The improvements strengthen safety for motorists traveling between Pennsylvania and New Jersey and enhance operational reliability on a key east–west route. Upgraded parapets, guide rails, and lighting contribute to safer travel, better visibility and long-term asset performance for one of the region’s busiest toll facilities.
Key stats and accolades
- 2.25 miles of roadway and bridge improvements
- Safety system and barrier upgrades to meet PennDOT, NJDOT and AASHTO standards
- Multi‑structure corridor including spans over SR 0611, SR 0519 and Ramp C
