D.C. Mun. Regs. tit. 11, r. 11-C716
A driveway serving as a motor vehicle queuing lane shall conform to the standards in this section.
The queuing lane shall provide a minimum of five (5) queuing spaces before the first service location and one (1) queuing space after the last service location before entering public space.
No queuing space may be located within twenty feet (20 ft.) of any street lot line.
Each queuing space shall be a minimum of ten feet (10 ft.) in width by nineteen feet (19 ft.) in length and shall constitute an exclusive queuing lane.
The queuing lane shall not be the only entry or exit lane on the premises.
Any lighting used to illuminate the queuing lane shall be so arranged that all direct light rays are confined to the surface of the queuing lane.
D.C. Mun. Regs. tit. 11, r. 11-C716