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  2. 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 ...

  3. Traffic light rating system - Wikipedia

    en.wikipedia.org/wiki/Traffic_light_rating_system

    In the British Civil Service and other departments of the United Kingdom government, traffic light colours are used as a coding system for good or bad performance, usually known as a 'RAG rating'—Red, Amber, Green. For example, a red workload performance would mean inadequate, amber would mean reasonable, and green would mean good.

  4. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    This is an accepted version of this page This is the latest accepted revision, reviewed on 6 February 2025. Signaling device to control competing flows of traffic This article is about lights used for signalling. For other uses, see Traffic light (disambiguation). "Stoplight" redirects here. For other uses, see Stoplight (disambiguation). An LED 50- watt traffic light in Portsmouth, United ...

  5. 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 ...

  6. Yellow trap - Wikipedia

    en.wikipedia.org/wiki/Yellow_trap

    The yellow trap occurs when the timing of the amber lights (also known as "yellow" lights in the USA) is asymmetric for two-way traffic on a single road: when a vehicle is waiting to turn across oncoming traffic and receives an amber light from the traffic signal, the driver may assume that oncoming traffic also has received an amber light and ...

  7. Traffic warning sign - Wikipedia

    en.wikipedia.org/wiki/Traffic_warning_sign

    Vienna Convention traffic signal ahead (white triangle) These warning signs indicate that traffic lights are ahead, and are often used when it is difficult to see that a traffic light may already be showing red, to warn a driver to prepare to slow down. They may be supplemented with flashing light or lighted sign when light is red or turning red.

  8. History of traffic lights - Wikipedia

    en.wikipedia.org/wiki/History_of_traffic_lights

    An early two-light traffic signal by White Horse Tavern in Hudson Street, New York. Image taken in 1961. Despite the failure of the world's first traffic light in London in 1869, countries all around the world still made traffic lights. By 1880, traffic lights spread all over the world, and it has always been like that, since then.

  9. Traffic sign - Wikipedia

    en.wikipedia.org/wiki/Traffic_sign

    Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones. Later, signs with directional arms were introduced, for example the fingerposts in the United Kingdom and their wooden counterparts in Saxony.