OAR 734-078-0030
Warning Signs and Flags Required


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:


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;


The highway yellow background of the sign must be made of reflectorized material when operating between sunset and sunrise;


Signs must be kept clean, legible, and mounted with adequate support to provide full visibility at all times when in use;


Signs must not cover or interfere with the visibility of the vehicle’s registration plates;


Signs must be constructed of a material impervious to water; and


All signs must be removed or retracted when not required.


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.

Source: Rule 734-078-0030 — Warning Signs and Flags Required, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=734-078-0030.

Last Updated

Jun. 8, 2021

Rule 734-078-0030’s source at or​.us