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  2. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    A speed sign is a special traffic light, variable traffic sign, ... Exemptions are made for temporary or replacement signals. [citation needed] Mounting and placement

  3. Road signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Road_signs_in_the_United...

    11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).

  4. Traffic sign design - Wikipedia

    en.wikipedia.org/wiki/Traffic_sign_design

    These non-permanent temporary signs are erected to warn drivers of unexpected conditions such as road work zones, diversions, detours, lane closures and traffic control. Often these signs are portable and can also be digital variable message signs. [1] In the United States, these signs are typically orange in color.

  5. Variable-message sign - Wikipedia

    en.wikipedia.org/wiki/Variable-message_sign

    Trailer-mounted variable-message signs are used to alter traffic patterns near work zones, and for traffic management for special events, natural disasters, and other temporary traffic patterns. The messages displayed on the sign can be programmed locally on the unit's control panel, or units equipped with a cellular modem can be programmed ...

  6. Variations in traffic light operation - Wikipedia

    en.wikipedia.org/wiki/Variations_in_traffic...

    The small light at the top tells the driver when the vehicle's transponder signal is received by the traffic light. In traffic engineering, there are regional and national variations in traffic light operation. This may be in the standard traffic light sequence (such as the inclusion of a red-amber phase) or by the use of special signals (such ...

  7. Glossary of road transport terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_road_transport...

    A person who directs traffic through a construction site or other temporary traffic control zone past an area using gestures, signs or flags. Traffic island, painted island, or ghost island A solid or painted object in a road that channelises traffic. Traffic light Signaling devices positioned at road intersections, pedestrian crossings and ...

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