D.C. Mun. Regs. tit. 31, r. 31-815
Taxicabs licensed under § 31(d) of the License Act (D.C. Official Code § 47-2829(d) (2001)) may engage in a pick-up and delivery service limited to messages and parcels; provided, that the service is subordinate to their primary obligation to transport passengers.
No taxicab driver shall refuse to transport any passenger while engaged in a pick-up and delivery service, unless the service fairly meets the test of an emergency (where time is of the essence) delivery. The burden of proof shall rest upon the driver to establish the emergency character of the service being rendered.
Each driver who undertakes to perform a pick-up and delivery service shall complete the delivery within a reasonable time, but in no event later than three (3) hours after receiving the item to be delivered.
Pick-up and delivery service shall be limited to the use of the trunk, front seat or front floor of the vehicle, unless the person who engages the service accompanies the articles to be transported. If the person who engages the service does not accompany the articles to be transported, the back seat of the vehicle shall be reserved solely for the transportation of passengers in accordance with the Commission's rules.
D.C. Mun. Regs. tit. 31, r. 31-815