Pennsylvania commercial vehicle weight limits follow the federal Interstate standard of 80,000 lbs gross, 20,000 lbs per single axle, and 34,000 lbs per tandem axle group. The federal bridge formula (23 U.S.C. 127) applies on all routes. Pennsylvania imposes spring weight restrictions on certain secondary roads and state routes during spring thaw, typically March through April. Restrictions reduce allowable axle weights on posted roads. Check PennDOT for current restrictions and lifting dates. Oversize and overweight permits are available from PA DOT for loads exceeding standard limits. Verify current road-specific postings with the Pennsylvania DOT before routing heavy loads.
Pennsylvania imposes spring weight restrictions on certain secondary roads and state routes during spring thaw, typically March through April. Restrictions reduce allowable axle weights on posted roads. Check PennDOT for current restrictions and lifting dates.
Check current restrictions at PA DOT →The federal bridge formula limits the weight on any group of axles based on the distance between the outermost axles in the group. It applies in Pennsylvania on all routes where federal standards apply.
W = maximum weight in lbs · L = axle spacing in feet · N = number of axles
PennDOT issues oversize/overweight permits online. Pennsylvania Turnpike permits issued separately by the PA Turnpike Commission. Superloads require engineering review and may require police escort. Pittsburgh and Philadelphia require additional city permits.
Apply for Pennsylvania OS/OW Permit →On Pennsylvania Interstate highways, the maximum gross vehicle weight is 80,000 lbs matching the federal standard. The Pennsylvania Turnpike and state routes may have additional restrictions near older bridges and tunnels. Overweight permits are required for loads exceeding standard limits.
Pennsylvania has a reputation for strict weight enforcement. State Police and PennDOT operate active weigh stations on major corridors including I-78, I-80, I-81, and the PA Turnpike. Overweight violations carry substantial fines — per-axle overweight fines can reach into the thousands of dollars.
Yes. Pennsylvania imposes spring weight restrictions on certain secondary and state routes during spring thaw, typically March through April. Restricted roads reduce allowable axle weights. Check PennDOT's website for the current restricted route list and lifting dates before routing through secondary roads.
The Pennsylvania Turnpike (I-76, I-276, I-476) follows the federal 80,000 lb gross limit. However, specific structures — particularly tunnels — may have lower limits or require special permits. Contact the PA Turnpike Commission for current restrictions before routing oversized loads.
PennDOT oversize/overweight permits can be obtained online through the PennDOT permit portal. The Pennsylvania Turnpike requires a separate permit from the Turnpike Commission. City permits from Pittsburgh or Philadelphia are required for loads on city streets.
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The information on this page is compiled from publicly available government sources and is provided for general informational purposes only. TruckRadar is an independent search engine — we are not affiliated with any government agency and this content does not constitute legal or compliance advice. Regulations change frequently; always verify current requirements directly with the official source before making compliance decisions.
Official source: Pennsylvania PA Department of TransportationLast reviewed: 2026-04