Pennsylvania Tire Chain Laws

How Pennsylvania handles chains

There is no year-round chain mandate. When a storm hits, PennDOT and the PA Turnpike post Winter Event Vehicle Restrictions, five tiers deep, on any corridor they choose. At Tier 2, a tractor towing loaded tandem trailers cannot proceed without chains or an approved alternate traction device aboard. At Tier 3 loaded tandems are out, and other loaded CMVs, box trucks included, need the same. Tier 4 bans all CMVs. Where a chain-up area's signs are flashing, you must mount chains or cables. 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. For trucks, 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. Buses face it from Tier 1: a school bus, commercial bus or motor coach without chains or an ATD aboard cannot run. Separately, at a designated chain-up area you must mount chains or cables whenever PennDOT turns on the flashing signs. PennDOT activates those signs when it judges conditions call for it, not by tier.
• Where: State roads and the PA Turnpike statewide, wherever PennDOT or the Turnpike posts the active tier. The plan covers limited-access highways but does not confine a tier to them. 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. Chains must be mounted at designated chain-up areas, marked by advance signs with flashing lights. The plan lists no sites. PennDOT District 2 named two: Route 322 westbound before the Milroy exit and Seven Mountains, and Route 153 northbound before Boone Mountain in Clearfield County, with chain-removal areas at each summit. If you have no chains, you must take another route.
• Applies to: Set by tier. Tier 1 hits tractors without trailers, empty or lightly loaded rigs and box trucks, RVs, passenger vehicles towing trailers, motorcycles, and buses without chains or an ATD on board. Oversize loads are barred at every tier, 1 through 5, on the plan chart, even though the written Tier 1 list does not name them. 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 bans loaded tandems even with chains, and every other loaded CMV, box trucks included, runs only with full-coverage chains for at least two drive wheels or an approved ATD on board. Tier 4 bans all CMVs. Tier 5 bans every vehicle except emergency responders. When a weather speed restriction is in place, all CMVs and passenger vehicles towing trailers must also stay in the right lane. PennDOT can impose that with or without a tier.
• 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 all other loaded CMVs, box trucks included. Under the tiers the device only has to be on board, not mounted, because the plan legend reads Not Permitted EXCEPT with Chains/Traction Devices on Board. You need chains for at least two drive wheels, full coverage at Tier 3. They must be readily available, and when you put them on they go on tires at opposite ends of the same drive axle. A qualifying chain has a circular metal loop on each side of the tire joined by at least nine evenly spaced loops across the tread. Tire cables with high-strength steel cross-member rollers 0.415 in or more in diameter, in the same layout, can replace chains. The approved ATDs are wheel sanders carrying enough sand for the restricted area, pneumatically driven chains, and emergency dig-out chains, which you must remove before continuous driving. Low-clearance buses such as motor coaches may also use approved manufactured devices that fully encircle the drive wheels. Textile socks are not on the list. At a designated chain-up area only chains or cables count, and dig-out chains do not. 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.

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