D.C. Mun. Regs. tit. 31, § 505
505.1 The Office shall not issue independent taxicab numbers.
505.2 Existing independent taxicab numbers shall only be displayed on taxicabs:
(a) In a manner consistent with § 503.3(d); and
(b) By the independent owner in possession of the independent taxicab number after October 1, 2013.
505.3 An independent taxicab owner, prior to painting the taxicab, shall submit to the office an application for Commission approval listing the basic color together with all lettering, logo or insignia to be used.
505.4 Each independently operated taxicab shall have on the exterior of each rear door the name of the owner and a telephone number for contact purposes. The telephone number may be either a currently working home or cellular telephone number.
505.5 [REPEALED]
505.6 The word "taxicab" shall be on each rear door under the name, trade name or insignia, unless the word "cab" is part of the trade name or insignia.
505.7 Each independently owned and operated taxicab shall be assigned an Independent Taxicab Number by the Office. The number shall be placed on the taxicab within a rectangle on each rear door, centered under the owner's name, trade name, or insignia, and on the right side of the rear of the taxicab, so as to be clearly visible from the rear.
505.8 All letters and numbers on independently operated taxicabs shall be Gothic in style, three inches (3 in.) high, three eighths of an inch (3/8 in.) wide, and with three eighths of an inch (3/8 in.) between each digit and the inside edge. The letters and numbers shall also be painted as follows:
(a) On taxicabs with the body painted black, the numbers, letters, and rectangles shall be white; or
(b) On taxicabs with the body painted white, the numbers, letters, and rectangles shall be black.
505.9 An Independent Taxicab Number assigned by the Office to a taxicab shall not be transferred to another taxicab, except by the Office.
505.10 If an Independent Taxi Number assigned by the Office is surrendered by the operator or revoked by the Commission, the number may not be reclaimed after six (6) months and the assigned number may be redistributed by the Office.
SOURCE: Final Rulemaking published at 37 DCR 3595, 3599 (June 1, 1990); as amended by Final Rulemaking published at 40 DCR 4047, 4048 (June 25, 1993); and by Final Rulemaking published 45 DCR 8866, 8867 (December 11, 1998); as amended by Final Rulemaking published at 52 DCR 6678 (July 15, 2005); as amended
by Final Rulemaking published at 53 DCR 853 (February 10, 2006); as amended by Final Rulemaking published at 59 DCR 8549, 8554 (July 20, 2012); as amended by Final Rulemaking published at 60 DCR 12387 (August 30, 2013).