Abstract: An apparatus of electromechanical or solid-state character is provided for intermittently blinking the traffic control signals at street and road intersections to inform motorists and pedestrians at intervals during each period the lights are red or green as to the time remaining before the lights are changed to green or red to indicate a change in direction of traffic. The apparatus includes an interrupter switch in the power line of the traffic lights and a timer for the interrupter switch cycled by a pulse from the controller of the traffic lights each time the lights are changed. During each cycle of the timer the interrupter switch is operated at intervals to provide distinguishing signals each differing by one blink from the other. For example, the traffic lights may be blinked once when 30 seconds remain before the lights will change and twice at a rate of 3 to 6 per second when 15 seconds remain.

Abstract: A street name sign comprising one or more sign heads of a hollow, aluminum-frame construction mounted on a post cap via a center staff and a nut threaded thereon against the post cap is provided with a vandal-proof arm secured to the center staff, which is anchored deep in the cylindrical post or pipe supporting the sign to render the sign vandal-proof against unauthorized removal from the post and against being bent or broken by a yanking on the ends of the sign ends by one's full strength and weight. The vandal-proof arm may comprise a threaded extension of the center staff secured thereto through a staff nut used also to clamp the post cap to the sign heads, or preferably it may be an integral extension of the center staff having a one-way spring-lock washer thereon acting through a compression spring against the post cap to clamp the same to the sign heads.