Motorists traveling between Northcentral Pennsylvania and New York now have a smoother route, thanks to the official designation of a new stretch of Interstate 99. The highway, which will also carry the U.S. 15 designation, extends 62 miles from the I-180 interchange in Williamsport, PA, to the New York state line.
Federal, state, and local officials gathered in Tioga County to celebrate this milestone. “The investment insures a smooth, uninterrupted travel linking this region to our neighboring states and literally to the entire network of the United States,” said PennDOT Secretary Mike Carroll during the event.
The Federal Highway Administration approved the interstate designation after verifying that the corridor satisfies all federal criteria for interstate roadways, including design, safety, and performance standards. The new designation is expected to bolster local economies along the route, particularly in areas like Williamsport.
The development of I-99 has been a long-term effort, with work commencing back in 1984. This included new road layouts, improved shoulders, and upgraded access points. However, a gap remains between Bellefonte and Williamsport, with “trail blazing signs” planned to guide drivers until the route is fully completed.
Eric High, PennDOT District 3 Executive, remarked, “The completion of I-99 marks a transformative milestone for our region. One built through decades of investment, persistence, and partnership. This designation strengthens the connections for businesses, travelers, and communities and reflects our commitment to building infrastructure that supports long-term growth.”
Impact on Trucking Regulations
The new I-99 designation involves significant changes for trucking companies. Under federal interstate rules, the weight limit for divisible loads has been reduced from 95,000 pounds to 80,000 pounds, except in cases where a federal exemption applies:
- Once designated as I-99, the weight restriction will be reduced to 80,000 pounds for divisible loads.
- Divisible overweight permits will no longer be valid for travel on the designated section. However, milk haulers are permitted under federal law to operate overweight on interstates, including the future I-99 corridor.
- Haulers must adhere to these weight restrictions or reroute using alternative, approved state routes.
- The Automated Permit Routing and Analysis System (APRAS) will now prevent the issuance of new divisible overweight permits for this corridor.
- Permits for non-divisible oversize or overweight loads will continue to be issued and remain valid for travel along I-99.
Annual permit holders were informed of the changes towards the end of 2025 and again in early July once the federal approval was obtained, according to PennDOT.
