D.C. Mun. Regs. tit. 11, r. 11-C904
All loading berths and service/delivery spaces shall be accessible at all times from a driveway meeting the requirements of Subtitle C §§ 904.2 and 904.3.
A driveway or access aisle leading to a loading berth or service/delivery space shall have a minimum width of twelve feet (12 ft.), a maximum width of twenty-four (24) feet, and a maximum slope of twelve percent (12%).
No driveway providing access to a loading berth or service/delivery space shall be located in such a way that a vehicle entering or exiting from the loading berth blocks any street intersection.
A loading berth or service/delivery space shall be designed so that it is usable and accessible by the vehicles that it is intended to serve.
All loading berth or service/delivery space shall be located to be accessed from a public alley, where an open and improved alley of fifteen feet (15 ft.) width exists.
D.C. Mun. Regs. tit. 11, r. 11-C904