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    Commercial Motor Vehicle (CMV) restrictions are a critical tool in preventing winter incidents that occur on Pennsylvania's interstate system, and in keeping the public, including CMV drivers, safe.

    CMV accidents typically involve longer closure times as specialized equipment is necessary to remove the CMVs and typically some additional hazmat cleanup is necessary due to the larger fuel tanks and larger engines requiring additional fluids to run these vehicles.

    Additional resources, such as volunteer fire and rescue personnel, are necessary to support vehicles, including CMVs trapped in the queue from these longer-term incidents.

    CMV operators may be restricted from areas that do not appear to have adverse weather conditions to prevent them from entering areas with poorer conditions or to support other state's restrictions.

    Winter Event Vehicle Restrictions Fast Facts

    PennDOT, the Pennsylvania State Police, and the Pennsylvania Emergency Management Agency assess each winter weather forecast to determine if CMV restrictions are warranted. Then, they review the restrictions hourly once they have been initiated to determine if the conditions warrant the restriction or can be lifted.

    To view an overview of planned or active restrictions visit 511PA.com and select "Vehicle Restrictions" from the navigation bar.

    Commercial restrictions are lifted in a corridor approach to facilitate CMV movement once the restriction is safe to lift.

    CMV restrictions are specifically designed to promote life safety of all motorists impacted by long-term closures.

    PennDOT coordinates on these restrictions with neighboring states to minimize traffic impacts at the borders as much as possible (example, Pennsylvania may keep some of its restrictions in place longer because New Jersey still has its restrictions in place and CMVs and others may be traveling out of PA into NJ).

    During weather events, the PA Business Emergency Operations Center (PABEOC) at PEMA is a helpful communications tool between state agencies and the private sector. The PABEOC is activated during many disasters. It is a clearinghouse of vital information such as road restrictions, waivers, and proclamations of disaster emergency, power status, and other information businesses need to make operational decisions. You can exchange information with other businesses and know there is a place with trusted, accurate information.

    The PABEOC provides state-level information about restrictions and other event information through the dashboard and an email distribution list. Advanced event information can be found by accessing the PEMA PA Business Emergency Operations Center website. All of the current restrictions, Governor's proclamations, and waivers are housed in this location. The website includes weather maps as well as the current restriction maps and specific communications to private industry.

    There is also a working group of state and private partners called the Endeavor Group, which meets regularly to discuss private and state mobility concerns. If you are interested in participating, you can email PABEOC@pa.gov or call PEMA External Affairs at 717-651-2739.

    Level:  Weather “Levels” defined in PTC’s “Weather Event Management Playbook,” AKA Weather Plan. Weather Levels are communicated from the TOC and based on forecast and actual conditions during a weather event. There are four Weather Levels numbered one (1) through four (4), with Level 4 being the most severe.

    Tier: Travel Restrictions and Vehicle Bans are defined as “Tiers” in the multi-agency “Weather Event Vehicle-Restriction Plan.” PennDOT, PEMA, PSP, and the PTC work together to determine the appropriate Tier for any given weather event. There are five (5) Tiers numbered one (1) through five (5), with Tier 5 being the most severe.

    Restriction: Refers to travel restrictions: “Speed” and “Commercial Vehicles Right-Lane Only.”

    Ban:  Refers to vehicle bans, such as empties, doubles, RVs, etc.

    Download the quick reference guide for a PDF version of the information above.

    CMV restrictions are issued in tiers based on the severity of the winter weather event.

    Speed restrictions and right-lane-only travel restrictions for the following may be implemented independently or in conjunction with any of the tiered restrictions and restrictions listed below:

    Tier 1

    Under Tier 1 restrictions, the following vehicles are not permitted on affected roadways:

    • Tractors without trailers.
    • Tractors towing unloaded or lightly loaded enclosed trailers, open trailers or tank trailers.
    • Tractors towing unloaded or lightly loaded tandem trailers.
    • Enclosed unloaded or lightly loaded cargo delivery trucks/box trucks that meet the definition of a CMV.
    • Passenger vehicles (cars, SUVs, pickup trucks, etc.) towing trailers.
    • Recreational vehicles/motorhomes.
    • School buses, commercial buses and motor coaches without available chains or another approved Alternate Traction Device on board.
    • Motorcycles.

    Tier 2

    Under Tier 2 restrictions, the following vehicles are not permitted on affected roadways:

    • Tractors without trailers.
    • Tractors towing unloaded or lightly loaded enclosed trailers, open trailers or tank trailers.
    • Tractors towing loaded tandem trailers unless there are chains or another approved Alternate Traction Device (ATD) on board.
    • Enclosed unloaded or lightly loaded cargo delivery trucks/box trucks that meet the definition of a CMV.
    • Passenger vehicles (cars, SUVs, pickup trucks, etc.) towing trailers.
    • Recreational vehicles/motorhomes.
    • School buses, commercial buses and motor coaches, regardless of the availability of chains or ATDs.
    • Motorcycles.

    Tier 3

    On roadways with Tier 3 restrictions in place, no commercial vehicles are permitted EXCEPT loaded single trailers with chains or approved Alternate Traction Devices. Additionally, all school buses, commercial buses, motor coaches, motorcycles, RVs/motorhomes and passenger vehicles (cars, SUVs, pickup trucks, etc.) towing trailers are not permitted on affected roadways while restrictions are in place.

    Tier 4

    On roadways with Tier 4 restrictions in place, no commercial vehicles are permitted. Additionally, all school buses, commercial buses, motor coaches, motorcycles, RVs/motorhomes and passenger vehicles (cars, SUVs, pickup trucks, etc.) towing trailers are not permitted on affected roadways while restrictions are in place.

    Tier 5

    On roadways with Tier 5 restrictions in place, no vehicles are permitted, including passenger cars and trucks. The only vehicles permitted on affected roadways are emergency responders.

    Check 511PA for Vehicle Restrictions and Roadway Conditions

    511PA is a statewide travel information service which provides reliable traffic, weather and transit information. Travelers can use 511PA to track the location of PennDOT plows, vehicle restrictions, roadway conditions, and for incident updates across the Commonwealth.