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  2. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    Amber or yellow flashing lights and lightbars are for warning some special attribute (e.g. oversized, slow, parking at unexpected places etc.) of vehicles like garbage trucks, road cleaning/control/repair, snow plow, car assistance services, construction, transporting dangerous materials etc. Amber/yellow lights do not grant traffic privileges ...

  3. Variations in traffic light operation - Wikipedia

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

    Red lights supplement stop signs on the side road approaches. All-way red flashing lights can supplement all-way stop control, but all-way yellow signals are prohibited by US regulations. In Canada a flashing yellow light at an intersection that would otherwise have traffic signals indicates that the traffic signals are malfunctioning.

  4. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    In the US, a single-aspect flashing amber signal can be used to raise attention to a warning sign and a single-aspect flashing red signal can be used to raise attention to a "stop", "do not enter", or "wrong way" sign. [32] Flashing red or amber lights, known as intersection control beacons, are used to reinforce stop signs at intersections. [33]

  5. Automotive lighting - Wikipedia

    en.wikipedia.org/wiki/Automotive_lighting

    Special warning lights, usually amber, ... LED lights are used for flashing beacon lights on vehicles such as maintenance trucks. [139] Previously, traditional light ...

  6. Traffic warning sign - Wikipedia

    en.wikipedia.org/wiki/Traffic_warning_sign

    In modern regulations, U.S. warning signs are classified as Series W signs, starting with the W1 Series (curves and turns) and ending with the W25 Series (concerning extended green traffic lights). Some U.S. warning signs are without category while others like the warning stripes at tunnel portals or plain red End of Roadway signs are ...

  7. Rules for traffic lights - Wikipedia

    en.wikipedia.org/wiki/Rules_for_traffic_lights

    A flashing amber traffic light usually indicates you have a yield or stop sign as a redundant sign, while a turned-off traffic light usually indicates you have the right-of-way. In the UK and parts of North America, drivers simply treat the junction as being uncontrolled when traffic lights fail, giving way as appropriate, unless a police ...