|FHWA Policy Memorandums|
This sheet gives the design and fabrication details, including dimensions, for the Traffic Signal Photo Enforced (R10-18a) sign. The R10-18a sign is shown as a vertical rectangular white sign with a black border and the words "PHOTO ENFORCED" in black on two lines below a traffic signal symbol. The traffic signal symbol is a black vertical rectangle upon which are, from top to bottom, a red circle, yellow circle, and green circle representing the lenses of a traffic signal face.
United States Department of Transportation - Federal Highway Administration