A new interstate is scheduled to open in Pennsylvania on July 30.
The Pennsylvania Department of Transportation said the newly designated Interstate 99 will support freight movement and ensure compliance with modern weight and design requirements.
This designation was granted by the Federal Highway Administration after the agency determined all federal standards for design, safety and performance have been met.
I-99, previously U.S. Highway 15, runs 62 miles from the Interstate 180 interchange in Williamsport, Pa., to the New York/Pennsylvania border.
PennDOT said it has completed 34 projects totaling $480 million on this highway since 1984.
“This designation from U.S. 15 to I‑99 reflects decades of planning and hard work to make a significant investment in our future,” PennDOT Secretary Mike Carroll said. “I‑99 strengthens the region’s transportation network by enhancing long-term safety, mobility and economic opportunity throughout the region.”
Changes for freight haulers on I-99
- Maximum weight will be reduced to 80,000 pounds for divisible loads, in accordance with federal law
- Divisible overweight permits will no longer allow travel on the designated section
- The Automated Permit Routing and Analysis System will prevent new divisible overweight permits from being issued for this corridor
- Permits for non-divisible oversize or overweight loads will continue to be issued and remain valid for I-99 travel
- Milk haulers are allowed by federal law to operate overweight on interstate highways, including I-99
I-99 will connect the region with key routes like Interstates 80 and 86, making travel more efficient, bolstering local economies by attracting business investment and improving clarity for road users, PennDOT said.
Traffic conditions are available 24/7 on this Land Line resources page.
Updated signage is being installed from I-180 to the New York state line, while trailblazing signs are being added to Route 220 and I-80.
PennDOT said it distributed information about the I-99 designation in December 2025 and July 2026 to annual permit holders, elected and municipal officials and the Pennsylvania Motor Truck Association.
More information about the project is available online.
Industry partners and permit holders can contact Nicole Marcyan, APRAS Coordinator, District 3, for additional assistance. LL
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