I-99 Lane Closures to Begin September 21
Logistics operators should anticipate travel delays as crews begin removing median barriers to advance interchange construction.
Updated on Sept. 20, 2026 in Openings & Closings
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Starting September 21, 2026, PennDOT will close the left lanes of I-99 in both directions to facilitate median removal. This work is part of a larger $259 million project designed to improve traffic safety by connecting I-80 and I-99.
Why it matters
The project aims to rectify long-standing infrastructure gaps to improve transit flow between major highways. For operators, these closures shift transit routes and increase travel times for regional supply chains through 2030.
The $259 million interchange project is supported by $170 million from the federal Bipartisan Infrastructure Law, following a $52 million initial phase supported by a $35 million federal INFRA grant.
The players
PennDOT
The Pennsylvania Department of Transportation responsible for state infrastructure maintenance and highway construction oversight.
Trumbull Corporation
A heavy construction firm based in Pittsburgh, Pennsylvania, specializing in large-scale infrastructure and highway interchange projects.
The details
Contractor Trumbull Corporation will remove the concrete median between I-80 and I-99 to accommodate the new interchange design. During the lane closures, commercial traffic and regional commuters must utilize exit 83 to Route 550 to reach Musser Lane, as direct access remains restricted. This phase is critical to the broader construction timeline, which includes building 10 bridges and 4 retaining walls, and is slated for completion in 2030.
Timeline
September 21, 2026: Left lane closures on I-99 commence.
Early October 2026: Scheduled end date for the current passing lane closures.
2030: Final completion date for the entire interchange project.
Market Landscape
The project follows the established pattern of states leveraging federal Bipartisan Infrastructure Law funds to execute long-term, high-budget interchange redesigns. This work aligns with regional infrastructure modernization trends aimed at reducing congestion at critical highway junctions.
Operators reliant on I-99 for freight movement should build extra buffer time into schedules until early October. Review dispatch routes to account for the mandatory detour at exit 83 and avoid restricted access points at Musser Lane.
The takeaway
This closure is a temporary but necessary step in a long-term overhaul of the I-80/I-99 connection. Managers should track progress on the PennDOT portal to forecast future lane restrictions that could affect regional fleet efficiency.
What happens next
Construction on the interchange is scheduled to continue through 2030.
Further reading
For updates on regional traffic, check Pennsylvania Openings & Closings.
More information
Check real-time road traffic conditions on the state portal for live updates.
Live Poll
Do you believe local highway construction projects are worth the resulting traffic delays in your area?
