Design of movable bridge signals and gates (Repealed)

(a) The signal heads and mountings of movable bridge signals shall follow the standard design specifications for traffic control signals. (b) Nominal eight-inch signal indications are standard. However, if prevailing approach speeds are in excess of 25 mph or when considerations such as roadway width or geometries, signal locations, conflicting lights or objects in the background, etc., indicate the need for greater signal effectiveness, signal heads with twelve-inch diameter lenses should be provided. (c) Movable bridge signals may be supplemented with bells to provide additional warning to drivers and pedestrians. The standard three color (red, yellow and green) traffic signal indications shall be utilized. (d) A "Drawbridge Ahead" warning sign shall be used in advance of movable bridge signals and gates to give advance warning to motorists, except in urban conditions where such signing would not be practicable. Such signs may be supplemented by a hazard identification beacon. (e) If the movable bridge is close to a railroad grade crossing and there is a possibility that traffic may be stopped on the crossing as a result of the bridge opening, a traffic control device should be provided to give notification to the driver not to stop on the railroad tracks. Extreme care should be used in planning such installations to avoid creating confusion or hazardous conditions. (f) Signals on adjacent streets and highways should be interconnected with the drawbridge control, if indicated by engineering considerations.