Maryland law requires that every registered truck over 10,000 pounds, truck tractor and bus operated on public roads, unless specifically exempt*, must display either a US DOT or a Maryland issued motor carrier identification number by July 1, 2002. If you are a motor carrier who is not required to have an US DOT # because your vehicles do not leave Maryland and you do not handle interstate cargo, you must obtain a Maryland identification number (MD DOT #) and display it on your trucks, truck tractors and buses.Motor carriers that are interstate or intrastate must apply for an US DOT# from the Federal Motor Carrier Safety Administration (FMCSA). Applicants may apply online at their website www.fmcsa.dot.gov (listed under Registration).
US DOT Numbers and MD DOT Numbers must be displayed in compliance with Federal Motor Carrier Safety Regulations (FMCSR) part §391.21. Motor carriers not in compliance are subject to fines. *The following vehicles, if only operated intrastate, are exempt: Farm trucks, farm truck tractors, farm-area motor vehicles, emergency vehicles, vehicles primarily transporting money or commercial paper, vehicles owned or operated by the State or local government, and vehicles within 15 days of their purchase.
707 North Calvert Street
Baltimore, Maryland 21202-3601
Main Business Line – 410-545-0300
Safety Campaigns – 1-800-323-6742
For emergencies, call MDOT SHA's Statewide Operations Center at 410-582-5650.
Frequently Asked Questions
Public Information Act