D.C. Mun. Regs. tit. 18, r. 18-2225
No person shall stop or park a vehicle in such manner as to impede or render dangerous the use of a roadway by others, except to avoid a collision, at the direction of an authorized official, or in the case of an incident or mechanical breakdown.
In the event of a collision or mechanical breakdown of a motor vehicle, the operator of the vehicle shall activate the emergency flashing lights and shall move the vehicle from the roadway as soon as it is safe to do so and only as far as is necessary to prevent obstructing the regular flow of traffic.
Removal of a vehicle from the roadway in accordance with Subsection 2225.2 shall in no way affect responsibility for the collision or mechanical breakdown.
An operator who moves a vehicle from a roadway in accordance with Subsection 2225.2 shall not be considered to have interfered with or prevented a police investigation of the collision or mechanical breakdown.
D.C. Mun. Regs. tit. 18, r. 18-2225