CMVs engaged in interstate commerce must have the following markings on both sides of the self-propelled CMV:
- The motor carrier’s legal name or a single trade name, as listed on the motor carrier identification report;
- The motor carrier’s identification number, preceded by the letters “USDOT;” and
- Letters that contrast sharply in color with the background on which they are placed and are legible during daylight hours from a distance of 50 feet.
See additional guidance on marking CMVs and intermodal equipment at 49 CFR 390.21.