92 Ill. Adm. Code 547.400
Sign Design
Section 547.400 Sign Design
a) The
sign shall be a standard 48" wide x 60" tall on freeways and 30"
wide x 36" tall on other streets or roads. It shall contain the words "EXCESSIVE
ENGINE BRAKING NOISE PROHIBITED" in black lettering on a
retroreflectorized white background and shall carry the Illinois Department of
Transportation Sign Standard Number R5-I106.
b) The
sign may be supplemented by a panel mounted underneath with the legend "ON
VILLAGE (CITY) STREETS, NEXT 2 MILES, 7 PM-8 AM" or similar wording in
black lettering on a retroreflectorized white background specifying the extent
and/or time limits of the prohibition.