Pennsylvania Tire Chain Laws

How Pennsylvania handles chains

There is no year-round chain mandate. When a storm hits, PennDOT posts Winter Event Vehicle Restrictions on interstates and expressways, five tiers deep. At Tier 2, a tractor towing loaded tandem trailers cannot proceed without chains or an approved alternate traction device aboard. Tier 3 bans nearly all commercial rigs except loaded single trailers carrying chains. Tier 4 bans all CMVs. Check 511PA for the active tier before you roll.

When, where, and what counts

• When required: Winter storms only. PennDOT posts tiered Winter Event Vehicle Restrictions (Tiers 1-5) on message boards and 511PA. The chain or approved-ATD duty is live only while a Tier 2 or Tier 3 restriction is posted on your road. It lifts when the tier drops.
• Where: Interstates and expressways (limited-access highways) statewide, wherever the active tier is posted. Named event by event, this hits corridors like I-80, I-81, I-70, I-78, I-79, and the I-76/I-276 Turnpike.
• Applies to: Set by tier. Tier 1 hits tractors without trailers, empty or lightly loaded rigs, box trucks, RVs, passenger vehicles towing trailers, motorcycles, and buses without chains or an ATD on board. Tier 2 keeps all of those out, bans buses outright, and stops tractors towing loaded tandem trailers unless chains or an approved ATD are on board. A loaded single trailer still runs at Tier 2 with no chain condition. Tier 3 allows only loaded single trailers with chains or an ATD. Tier 4 bans all CMVs. Tier 5 bans every vehicle except emergency responders.
• Chains vs traction devices: PennDOT accepts chains or another approved Alternate Traction Device (ATD) to let a CMV proceed where the tier allows it, at Tier 2 for tractors towing loaded tandem trailers and at Tier 3 for loaded single trailers. The device only has to be on board, not mounted, because the plan legend reads Not Permitted EXCEPT with Chains/Traction Devices on Board. PennDOT publishes no list of qualifying devices in the plan and excludes no chain type. A vehicle hauling 1/3 of its GVW counts as a full load, which is what puts you in the loaded rows. At Tier 4 and above, no device lets a CMV proceed.
• Check the live order: 511PA.com (Vehicle Restrictions layer) or dial 511 for the active tier on your route before and during the storm.
• Fine: Not a fixed figure. Driving a restricted vehicle during an active tier is a summary traffic violation under the PA Vehicle Code, and you can be turned back or barred from the restricted roadway. No published chain-law dollar amount.

More for Pennsylvania