D.C. Mun. Regs. tit. 31, § 610
610.1 There shall be displayed in a conspicuous location in each taxicab in clear view of the passenger a notice in a form created by Office which contains the following information:
(a) A statement that a taxicab must accept credit cards through the approved taximeter system;
(b) A statement that a taxicab shall not operate without a functioning taximeter system;
(c) A statement that failure to accept a credit card is in violation of the law and is punishable by a fine; and
(d) Information required for passengers to submit an alleged violation or complaint, including the Commission's telephone number and website address.
610.2 [REPEALED].
SOURCE: Final Rulemaking published at 60 DCR 7007 (May 17, 2013); as amended by Final Rulemaking published at 63 DCR 338 (January 8, 2016).