Commercial motor vehicle (CMV) operators keep the American economy moving forward. Whether you are driving an interstate freight tractor-trailer along I-495, hauling heavy aggregate materials in Prince George’s County, managing a regional passenger bus route, or operating a commercial delivery fleet across Maryland, your CDL medical clearance is the foundation of your career. Contact Details for DOT Physical Upper Marlboro, MD : Phone : 240-221-5858 Email : compliance@lives