OAR 734-078-0030: Warning Signs and Flags Required

(1) When the combinations of vehicles and load exceed 80 feet in overall length a “LONG LOAD” or “OVERSIZE LOAD” sign is required to be attached to the rearmost position practical, either on the load or the last vehicle: (a) The sign must be seven feet wide by 18 inches high with black letters 10 inches high in accordance with Federal Highway Administration series C on highway yellow background; (b) The highway yellow background of the sign must be made of reflectorized material when operating between sunset and sunrise; (c) Signs must be kept clean, legible, and mounted with adequate support to provide full visibility at all times when in use; (d) Signs must not cover or interfere with the visibility of the vehicle’s registration plates; (e) Signs must be constructed of a material impervious to water; and (f) All signs must be removed or retracted when not required. (2) When a load extends beyond the rear body of the vehicle four feet or more, the outermost extremity of the load must be visibly marked with a red flag not less than 18 inches square. The attachment device must not extend beyond the rear of the load by more than three inches.