D.C. Mun. Regs. tit. 20, § 913
913.1 Clean-fuel vehicles operated by covered fleets shall be exempt from measures which restrict vehicle usage based primarily on temporal considerations, such as time-of-day and day-of-week restrictions and commercial vehicle bans. This exemption does not include access to High-Occupancy Vehicle lanes, except as provided in § 913.2 of this section.
913.2 A fleet vehicle which has been certified by the Environmental Protection Agency as an ILEV, is operated by a covered fleet, and continues to be in compliance with applicable ILEV emission standards shall be exempt from High-Occupancy Vehicle lanes. This exemption shall not apply if, by regulation, it is determined that it would create a clear and direct safety hazard.
913.3 The exemptions provided under this section shall be available to covered fleet vehicles upon the adoption of this chapter.
913.4 Transportation control measure exemptions shall be subject to the following conditions:
(a) The exemptions shall not be effective outside of the covered area;
(b) The exemptions shall not be transferable among vehicles in the same fleet; and
(c) Covered fleet operators may not buy, sell, or trade such exemptions.
913.5 The transportation control measure exemptions provided to covered fleet vehicles under this section shall remain in effect only if the subject vehicle is in compliance with the clean-fuel vehicle emission standards contained in this chapter.
SOURCE: Section 3(a) of the Clean Fuel Fleet Vehicle Program and Alternative Fuels Incentives Amendment Act of 1994, D.C. Law 10-201, 41 DCR 7178, 7194 (November 4, 1994).