D.C. Mun. Regs. tit. 18, § 2210
2210.1 Upon the immediate approach of an authorized emergency vehicle making use of audible and visual signals meeting the requirements of this title, or of a police vehicle properly and lawfully making use of an audible signal only, the driver of every other vehicle shall yield the right-of-way and shall immediately drive to a position parallel to, and as close as possible to, the right-hand edge or curb of the roadway, clear of any intersection, and shall stop and remain in such position until the authorized emergency vehicle has passed, except when otherwise directed by a police officer.
2210.2 Upon the approach of an authorized emergency vehicle, the operator of a streetcar shall immediately stop the car clear of any intersection and keep it in such position until the authorized emergency vehicle has passed, except when otherwise directed by a police officer.
2210.3 This section shall not operate to relieve the driver of an authorized emergency vehicle from the duty to drive with due regard for the safety of all persons using the highway.
2210.4 The driver of any vehicle other than one on official business shall not follow any fire apparatus traveling in response to a fire alarm closer than five hundred feet (500 ft.) or drive into or park such vehicle within the block where fire apparatus has stopped in answer to a fire alarm.
2210.5 No vehicle shall be driven over any unprotected hose of a fire department when laid down on any street, private driveway, or streetcar track to be used at any fire or alarm of fire without the consent of a police or fire department official.
SOURCE: Commissioners' Order 274, 310/949 effective September 1, 1949, 17 DCRR § 50, 101,102 (October 19, 1970).