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  2. List of automotive light bulb types - Wikipedia

    en.wikipedia.org/wiki/List_of_automotive_light...

    Bulbs used for headlamps, turn signals and brake lamps may be required to comply with international and national regulations governing the types of lamps used. Other automotive lighting applications such as auxiliary lamps or interior lighting may not be regulated, but common types are used by many automotive manufacturers.

  3. History of traffic lights - Wikipedia

    en.wikipedia.org/wiki/History_of_traffic_lights

    At the end of the 1980s, the introduction of Light Emitting Diode (LED) lights provided an even longer replacement cycle and lower energy use. In 1989, the first LED main traffic light was put in service in California. The system was created by Electro-techs in Corona (California), a company created by Raymond Deese in 1981. [31]

  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 19 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. Variations in traffic light operation - Wikipedia

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

    Louvers are fitted over the green and yellow balls of the left turn signal head to prevent driver confusion. The left turn signal head is also accompanied by a sign indicating its special use. [21] In this configuration, a green left arrow, with or without a circular green light, will only be displayed during a leading protected–left-turn phase.

  6. Road signs in the United States - Wikipedia

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

    Right turn signal. R10-10L Left turn signal. R10-10a ... Bicycle push button for green light. R10-25 ... (right) (this supplements the W10-1 sign but does not replace ...

  7. Signal lights - Wikipedia

    en.wikipedia.org/wiki/Signal_lights

    Signal lights may refer to: Traffic light, signal lights controlling automotive & pedestrian traffic flow; Turn signals, signal lights indicating automotive change of direction; Railway signalling, use of signal lights to control train traffic flow; Signal lamp, a device for communicating between ships with flashing lights.