D.C. Mun. Regs. tit. 18, r. 18-701
Notwithstanding any other provision of this chapter, the rules and regulations in this section (except as specifically provided otherwise by the Director for safety reasons) shall govern the requirements for vehicle equipment on historic motor vehicles being operated on the streets and highways of the District in conjunction with exhibitions, expositions, parades, tours, club activities, or similar activities or events, including transportation directly to or from such activities or events.
The provisions contained in the following subsections of this title shall be applicable to historic motor vehicles being operated on the streets and highways of the District:
No historic motor vehicle shall be required to achieve or comply with any equipment, material, or design standard which it was not legally required to achieve when it was manufactured.
With the exception of the equipment restrictions set forth in §§ 732 and 716.4, 716.5, 716.6, and 730.2 of this chapter, no historic motor vehicle shall be prohibited from having any vehicle equipment, accessory, type of material, or design feature with which it was or could have been legally equipped when it was manufactured.
No historic motor vehicle shall be required to achieve or comply with any performance standard with which it was not legally required to achieve or comply when it was manufactured. Performance standards shall include, but not be limited to, standards or requirements for exhaust and noise emissions and for fuel usage.
The installation or use of additional or improved safety equipment on an historic motor vehicle which was not available when the motor vehicle was manufactured shall not disqualify the motor vehicle for classification as an historic motor vehicle; Provided, that any additional or improved safety equipment shall be maintained in proper operating condition when the motor vehicle is operated on the public streets and highways.
A vehicle registered as a class F(I) historic motor vehicle that exceeds the maximum mileage limits set forth in D.C. Official Code § 50-1501.01 (j-l) shall have its registration suspended for a period of two (2) years or until such time as the owner registers the vehicle as a different class of vehicle, whichever is shorter. Such a vehicle shall not be registered as a class F (I) historic motor vehicle or class F(II) historic motor vehicle for a period of at least two (2) years from the date that its registration was suspended.
D.C. Mun. Regs. tit. 18, r. 18-701