With more than 90,000 vehicles traveling between Manhattan and New Jersey daily, the Holland Tunnel is a critical piece of roadway infrastructure in the Tri-State area. As part of a federal-funding program to make the tunnel more resilient against flooding and other natural disasters, STV was contracted by the Port Authority of New York & New Jersey to serve as the project manager and design engineer for a complex construction phasing plan that allows repairs to be made to the tunnel with minimal lane closures. The program is comprised of 13 individual projects including the design and installation of new flood protection barriers, and repairs to curbing, piping, wiring and control systems.

Due to the volume of motorists using the tunnel daily, the team helped develop a comprehensive transportation management plan that enables the contractor to construct tunnel improvements in a timely manner, while communicating the project’s impact to users. The firm also identified locations for CCTVs, traffic flow monitoring, and variable message sign equipment to monitor traffic operations and provide motorists with real-time information on work-zone travel times and upcoming roadway closure conditions.