D.C. Mun. Regs. tit. 18, § 1204
1204.1 Each bicycle shall be equipped with a brake which enables the operator to cause the braked wheels to skid on dry, level, clean pavement; provided, that a fixed gear bicycle is not required to have a separate brake, but an operator of a fixed gear bicycle shall be able to stop the bicycle using the pedals.
1204.2 Each bicycle, when in use at night, shall be equipped with a lamp on the front which shall emit a steady or flashing white light visible from a distance of at least five hundred feet (500 ft.) to the front and with a lamp on the rear which shall emit a steady or flashing red light visible from a distance of at least five hundred feet (500ft.) to the rear.
1204.3 [REPEALED]
1204.4 In place of the requirements of § 1204.2, a lamp may be worn on the body of an operator; provided, that it may be readily seen from the distances set forth in that subsection.
1204.5 A bicyclist riding within the District must be capable of making a warning noise, either with a bell or mechanical device, or with his or her voice, audible for a distance of at least one hundred feet (100 ft).
1204.6 A bicycle shall not be equipped with, nor shall any bicycle rider use, a siren of any kind.
1204.7 [REPEALED]
SOURCE: Regulation No. 72-13 effective June 30, 1972, 32 DCRR §§ 11.601 (c) – (d) Special Edition; as amended by Regulation No. 74-5 effective April 21, 1974; as amended by Final Rulemaking published at 53 DCR 6100 ( July 28, 2006 ); as amended by the Bicycle Safety Amendment Act of 2013, effective December 13, 2013 (D.C. Law 20-48; 60 DCR 15145 (November 1, 2013)); as amended by Vision Zero Enhancement Omnibus Amendment Act of 2020, effective December 23, 2020; (D.C. Law 23-158; 67 DCR 013057 (November 6, 2020)).