D.C. Mun. Regs. tit. 24, r. 24-817
No vehicle of any description shall be used in connection with the sale or distribution of any merchandise for which a license is issued, unless the Concessions Committee finds that the sale or distribution of the merchandise can be accomplished only from a fixed location.
Merchandise may be sold from a stand or vehicle stationed at a fixed location if the location is approved by the Concessions Committee, the Chief of Police, and the Director.
Whenever a stand or vehicle is used for the sale or distribution of merchandise, a pass or placard shall be issued by the Director for placement on the stand or vehicle.
Use of a vehicle for the sale of merchandise shall be limited to the period between 6:00 a.m. and 7:00 p.m. on Inauguration Day, unless further limited by the Concessions Committee.
D.C. Mun. Regs. tit. 24, r. 24-817