OAR 734-075-0045
Warning Signs and Flags Required


Over-width movements are required to display to the front and rear standard signs bearing the words “OVERSIZE LOAD”:


Signs 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 one half hour after sunset and one half hour before sunrise;


Signs must be kept clean, legible and mounted horizontally 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; and


All such signs must be removed or retracted when not required.


All four lower corners of any over-width load must be marked during daylight hours with red or fluorescent orange flags that are a minimum 18 inches square. Flags must be kept clean and must be clearly visible to the front and rear. The attachment device must not extend beyond the widest extremity by more than three inches on either side.

Source: Rule 734-075-0045 — Warning Signs and Flags Required, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=734-075-0045.

Last Updated

Jun. 8, 2021

Rule 734-075-0045’s source at or​.us