D.C. Mun. Regs. tit. 18, r. 18-2215
A person operating a motorcycle or motor-driven cycle shall ride only upon the permanent and regular seat attached, and the operator shall not carry any other person nor shall any other person ride on a motorcycle or motor-driven cycle unless the motorcycle or motor-driven cycle is designed to carry more than one person.
If a motorcycle or motor-driven cycle is equipped to carry more than one (1) person, the passenger may ride upon the permanent, regular seat if designed for two (2) persons, upon another seat firmly attached in a position to the rear or side of the motorcycle or motor-driven cycle and provided with foot rests and handgrips, or in a side car attached to the motorcycle.
No person shall operate or ride upon a motorcycle or motor-driven cycle unless wearing a protective helmet in the manner for which the helmet was designed and of a type approved by the Director. [See Chapter 7]
No person shall operate a motorcycle unless he or she wears goggles or a face shield of a type approved by the Director. [See Chapter 7]
The provisions of § 2215.4 shall not apply to an operator of a motorcycle equipped with a wind screen or shield of a type approved by the Director in accordance with Chapter 7, nor shall it apply to an operator of a motorcycle who wears spectacles with safety glass lenses during the operation.
The provisions of the Point System Regulations for the District of Columbia, shall not be applicable to violations of this section.
Autocycle operators or passengers shall not be required to wear a protective helmet, goggles, or a face shield if the autocycle has a non-removable roof and windshield and is fully enclosed.
D.C. Mun. Regs. tit. 18, r. 18-2215