5 Businesses under one roof, new car, used car, service, collision and parts. Each has own personality and structure. The car business is continuing to grow and change which keeps everyone on their toes. br Located at 801 Rockville Pike, Rockville, MD, you can also visit us online at www.congressionalmotors.com. We are open Monday-Friday 7am-7pm (with extended pick-up hours until 9pm) and Saturdays from 7am to 5pm.