Maryland Commercial Motor Carrier Compliance and Operations Guide
Maryland's guide to commercial motor carrier compliance: regulations, permits, parking, and safety enforcement for trucking operations.
Maryland has strict rules for commercial trucks. Trucks must have regular inspections, show special ID numbers, and get permits for carrying big or heavy loads. There are limited places for trucks to park, and parking on the side of highways is not allowed. Special offices handle truck permits and safety, and anyone can report unsafe trucks or drivers. Maryland wants all trucks to follow these rules to keep roads safe and organized.
What are the main commercial motor carrier requirements in Maryland?
Maryland commercial motor carriers must comply with state regulations on vehicle inspections, maintenance, and display of USDOT or state IDs. Truck parking is limited throughout the state. Special permits are needed for oversize/overweight loads, and parking on highway shoulders or ramps is prohibited.
Maryland's State Highway Administration maintains comprehensive compliance resources for commercial motor carriers operating within state borders. The Motor Carrier Division, headquartered at 7491 Connelley Drive in Hanover, serves as the primary regulatory authority for trucking operations and hauling permits throughout Maryland.
Regulatory Framework and Authority
Maryland's motor carrier regulations are codified primarily in COMAR Title 11, Subtitle 21, which governs commercial motor vehicle operations. The state's regulatory structure encompasses multiple title sections relevant to commercial drivers and carriers, including Title 13, Title 16, Title 21, Title 22, Title 23, and Title 25. These regulations address everything from vehicle safety standards to hauling permit requirements.
The Motor Carrier Safety Act establishes specific maintenance obligations for commercial vehicles. Owners of vehicles exceeding 10,000 pounds registered or operating gross weight must conduct inspections, maintenance, and repairs at intervals of 25,000 miles or 12 months, whichever comes first. Additionally, carriers must certify a preventive maintenance program approved by Maryland State Police. Heavy commercial vehicles face an additional requirement: proof of payment of the Federal Heavy Vehicle Use Tax before plates or renewal stickers can be issued.
Identification and Display Requirements
Maryland law mandates that most trucks, truck tractors, and buses operating on public roads display either a USDOT Number or a Maryland intrastate motor carrier identification number, unless specifically exempt. These identification numbers must be displayed in compliance with federal regulations, and carriers failing to meet this requirement face potential fines. The Maryland DOT Numbers program ensures proper identification and tracking of commercial vehicles throughout the state.
Truck Parking Regulations and Capacity
Maryland faces significant truck parking challenges, with limited designated truck parking spaces statewide. This includes public spaces at MDOT facilities and spaces at private truck stops. Public parking infrastructure consists of multiple rest areas, travel plazas, and welcome centers, plus numerous Truck Weigh and Inspection Stations (TWIS) providing truck parking spaces.
| Facility Type | Number of Locations | Available Spaces |
|---|---|---|
| Rest Areas/Welcome Centers | Multiple | Limited |
| TWIS Locations | Multiple | Limited |
| Private Truck Stops | Multiple | Varies |
| Total Statewide | *N/A * | *Limited * |
Parking availability becomes particularly constrained overnight, with Central Maryland and the Hagerstown area experiencing capacity limits by midnight. TWIS locations permit truck parking only when stations are closed, typically during overnight hours from 7 p.m. to 7 a.m. Examples include Perryville (59 northbound spaces, 52 southbound spaces), College Park (17 spaces), Hyattstown (12 northbound spaces, 12 southbound spaces), and West Friendship (18 spaces).
Truck parking on the shoulders of highways and entrance ramps of interstate, US, or State highways is unsafe and illegal, with violations resulting in citations.
Maryland law prohibits parking on ramps and on highways with two or more lanes in the same direction. Private truck stops remain the primary parking option for commercial drivers, while welcome centers and rest areas allow truck parking on a limited basis. During winter storms with six or more inches of snowfall, MDOT SHA designates certain commuter park-and-ride lots as safe haven parking for tractor-trailers, though year-round parking at these locations remains prohibited.
In July 2026, MDOT SHA completed an expansion at the I-70 South Mountain Welcome Centers, adding 25 spaces and bringing the site's total capacity to 74 truck parking spaces. The state continues seeking additional funding for further expansions at the I-95 College Park Truck Weigh Station/Park and Ride, I-95 NB Laurel Welcome Center, and I-70 Mount Airy Truck Parking Rest Area.
Hauling Permits and Oversize/Overweight Operations
The Hauling Permits Unit processes applications for vehicles exceeding standard size and weight limits. The unit maintains updated procedures for carriers seeking temporary exemptions from specific requirements. The unit maintains multiple contact channels: 410-582-5734, 410-582-5727, and toll-free 1-800-543-4564 during business hours. For after-hours emergency moves, carriers can reach the State Operations Center at 410-582-5650.
Permit applications require detailed route information and vehicle specifications. The Motor Carrier Division provides guidance on access provisions and routing restrictions for oversize and overweight loads operating on Maryland roadways. Carriers must comply with both state and federal regulations when transporting loads that exceed standard dimensions or weight limits.
Safety Reporting and Enforcement
To report an unsafe driver or falling or dropping loads, Maryland residents can dial #77. Unsafe trucking companies should be reported to the Maryland State Police Commercial Vehicle Enforcement Division at 410-579-5959.
The state maintains a multi-layered enforcement approach to commercial vehicle safety. Maryland State Police Commercial Vehicle Enforcement Division conducts roadside inspections and investigates safety violations. The Motor Carrier Division coordinates with law enforcement agencies to ensure compliance with state and federal regulations.
Contact Information and Resources
For general motor carrier questions, carriers can contact the Motor Carrier Division at 1-800-543-4564 or 410-582-5734. Hauling permit inquiries are handled at 410-582-5723 or 410-582-5727, while technical support is available at 410-582-5724 or 410-582-5731. Email correspondence can be directed to MdMotorCarrier@sha.state.md.us, haulingpermits@sha.state.md.us, or Superloads@sha.state.md.us depending on the specific inquiry.
The Motor Carrier Handbook, published by MDOT SHA's Office of Traffic and Safety, provides detailed guidance on Maryland's commercial vehicle requirements. This official publication serves as a primary reference for carriers navigating state regulations, enforcement contacts, and compliance obligations. The handbook works in conjunction with the state's online Regulations & Guidelines page, which links to relevant COMAR sections including 11.14.04, 11.14.05, and 11.22.02.