I-81 Corridor Study Page Interstate 81 was designed in the late 1950s and early 1960s. Over the past ten years, traffic volumes within our targeted I-81 corridor, including large commercial vehicles, have significantly increased over the system’s capacity. Within the past five years, traffic volumes on this portion of I-81 have increased at yearly rates, which are almost twice that of other urban interstates within Pennsylvania. The resulting congestion and high rate of reported crashes have initiated a detailed study of the corridor.

The expanded “Interstate 81 Corridor Improvement Study” was completed in August 2007 as a follow-up to the original I-81 Rebuild/Expansion study completed in August 2003. These studies were commissioned by PennDOT District 4-0 and were completed by Pennoni Associates Inc. The Interstate 81 Corridor Improvement Study identified the need for improvements to the targeted I-81 corridor based upon future capacity and traffic growth, level of service, and safety concerns. The work completed through these studies will serve as a planning and programming tool to help prioritize development of staged and system wide improvements.

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