Regulations of Connecticut State Agencies
(a) The Speed Limit sign shall display the limit established by law, or by regulation, after an engineering and traffic investigation has been made in accordance with established traffic engineering practices.
(b) The speed limits shown shall be in multiples of 5 miles per hour.
(c) No more than three speed limits should be displayed on any one speed limit sign or assembly. Where a special speed limit applies to trucks or other vehicles, the legend TRUCKS 40, or such similar message as is appropriate, shall be shown below the standard message or on a separate plate. When used independently, the Truck Speed sign should carry a reference to SPEED or MPH.
(d) Minimum speeds shall be displayed only in combination with the posted speed limit.
(e) The standard Speed Limit sign shall be 24 inches by 30 inches. On expressways the sign should be at least 36 inches by 48 inches, with 48 inches by 60 inches prescribed for use on freeways.
(Effective November 3, 1981)