D.C. Mun. Regs. tit. 18, r. 18-2505
The gross weights imposed upon the highway exerted through the wheels on any one axle of a vehicle shall not exceed twenty-one thousand pounds (21,000 lbs.).
Any one axle exceeding eighteen thousand pounds (18,000 lbs.) shall be equipped with four (4) properly inflated conventional-type tires or with two (2) properly inflated wide-base tires designed specifically for application as a replacement for conventional dual tires and rated equivalent in load carrying capacity.
For the purposes of this section, an axle load shall be defined as the total load imposed upon the highway through all wheels whose centers are included within two parallel transverse vertical planes not more than forty inches (40 in.) apart.
A loading error or tolerance of one thousand pounds (1,000 lbs.) is allowable for axle loads, and the same tolerance shall be applied for axle or gross loads permitted by special or annual permits; Provided, that any citation for overweight violation, when the load is in excess of one thousand pounds (1,000 lbs.) tolerance, shall be the total amount between the legal or permitted load and total load. The one thousand pounds (1,000 lbs) tolerance shall not be included in the amount of weight in the violation.
No group of two (2) or more consecutive axles shall carry a weight exceeding the value(s) given in the following table. However, if the gross weight of a vehicle or vehicle combination exceeds seventy-three thousand pounds (73,000 lbs.), the maximum weight imposed upon the highway exerted through the wheels of any one axle shall not exceed twenty thousand pounds (20,000 lbs.) nor shall a tandem axle exceed thirty-four thousand pounds (34,000 lbs.).
THE DISTANCE IN FEET BETWEEN THE EXTREMES OF ANY GROUP OF TWO OR MORE CONSECUTIVE AXLES | MAXIMUM WEIGHT IN POUNDS FOR ANY TWO OR MORE CONSECUTIVE AXLES (WHEELBASES) MORE CONSECUTIVE AXLES | ||||
2 AXLES | 3 AXLES | 4 AXLES | 5 AXLES | 6 AXLES | |
4-7 8 9 10 | 37000 37000 38000 39000 | 37000 41500 52500 | |||
11 12 13 14 15 | 40000 41000 42000 43000 | 43000 44000 44500 45500 46000 | 49000 49500 50500 51000 | ||
16 17 18 19 20 | 47000 47500 48500 49000 50000 | 51500 52500 53000 53500 54500 | 57000 57500 58000 59000 59500 | 65000 | |
21 22 23 24 25 | 50500 51500 52000 53000 53500 | 55000 55500 56500 57000 57500 | 60000 60500 61500 62000 62500 | 65500 66000 67000 67500 68000 | |
26 27 28 29 30 | 54500 55000 56000 56500 57500 | 58500 59000 59500 60500 61000 | 63000 64000 64500 65000 65500 | 68500 69000 70000 70500 71000 | |
31 32 33 34 35 | 58000 59000 59500 60500 61000 | 61500 62500 63000 63500 64500 | 66500 67000 67500 68000 69000 | 71500 72000 73000 73500 74000 | |
36 37 38 39 40 | 62000 62500 63500 64000 65000 | 65000 65500 66500 67000 67500 | 69500 70000 71000 71500 72000 | 74500 75000 76000 76500 77000 | |
41 42 43 44 45 | 68500 69000 69500 70500 71000 | 72500 73000 74000 74500 75000 | 77500 78000 79000 79000 79000 | ||
46 47 48 49 50 51 | 71500 72500 73000 73500 74500 75000 | 75500 76500 77000 77500 78000 79000 | 79000 79000 79000 79000 79000 79000 | ||
Whenever authorized signs are erected indicating a truck restriction, no person shall operate the type of truck prohibited on the street, except that the prohibited truck may be operated on the street or portions of the street for the sole purpose of making a delivery or pickup and then only by entering the street at the intersection nearest to the destination of the truck and proceeding on the street no further than the next intersection after the delivery or pickup has been completed.
D.C. Mun. Regs. tit. 18, r. 18-2505