D.C. Mun. Regs. tit. 17, r. 17-2202
Each coal dealer required to be licensed shall be provided with metal plates for each truck owned by the licensee and used for delivery of coal.
Each metal plate shall contain the following:
The number and date on the metal plate shall be in letters and figures not less than two inches (2") in height.
The metal license plate shall be conspicuously attached on the left side of each vehicle.
The number of metal license plates issued to a licensee shall not exceed the number of licensed trucks owned or operated by that licensee unless additional application in prescribed form setting forth sufficient cause is made, under oath, for each additional license plate.
No coal dealer shall permit use of any license plate issued under this section by any person other than the dealer.
No person shall use any license plate issued to any person other than himself or herself.
D.C. Mun. Regs. tit. 17, r. 17-2202