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Oklahoma has adopted Sec. 390.21 of the Federal Regulations.
Section 390.21 applies to intrastate drivers of vehicles with a gross vehicle weight rating or gross combination weight rating, or a gross vehicle weight or gross combination weight in excess of 26,000 pounds, or transporting hazardous materials requiring the vehicle to be placarded.
All commercial vehicles operating solely in intrastate transportation must display their USDOT number followed by “OK” on all vehicles.
Example: US DOT 123456 OK
A vehicle over 8,000 pounds combined laden weight used primarily for business or commercial purposes must have the name of the commercial establishment or the words “Commercial Vehicle” permanently and prominently displayed on the outside of the vehicle in letters not less than 2 inches high. The letters must be in sharp contrast to the vehicle’s background and must be of sufficient shape and color to be readily legible during daylight hours from a distance of 50 feet while the vehicle is not in motion.
All commercial motor carriers (for-hire and private) operating interstate are subject to the marking requirements of 49 CFR 390.21 which requires all CMVs to display, on both sides of the power unit, the US DOT number and the legal name of the business entity that owns or controls the motor carrier operation, or the “doing business as” (DBA) name, as it appears on the Form MCS-150.
Any new or used commercial vehicles added to a motor carrier’s fleet must be identified with the US DOT number and single trade name before being put into service.
The regulations do not require the MC number or city/state to be displayed on the vehicle.