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  2. Trafficators - Wikipedia

    en.wikipedia.org/wiki/Trafficators

    The shape differs in that the trafficator has only the lower 'blade' of the rail signal's terminal 'arrowhead', so that the retracted trafficator sits flush with the vehicle's exterior. They were common on vehicles until the introduction of the flashing amber, red or white indicators at or near the corners of the vehicle (and often along the ...

  3. Twilight switch - Wikipedia

    en.wikipedia.org/wiki/Twilight_switch

    Also, keep in mind that ignition is based solely on the amount of natural light present and not on the height of the sun, so "unwanted ignition" may occur, for example in the presence of compact clouds associated with a significant drop in ambient light on the sensor (e.g., when there is a storm). To avoid this, twilight switches can be ...

  4. Automotive lighting - Wikipedia

    en.wikipedia.org/wiki/Automotive_lighting

    Typically, bulbs of 21 to 27 watts producing 280 to 570 lumens (22 to 45 mean spherical candlepower) are used for stop, turn, reversing and rear fog lights, while bulbs of 4 to 10 W, producing 40 to 130 lm (3 to 10 mscp) are used for tail lights, parking lights, side marker lights and side turn signal repeaters.

  5. Output signal switching device - Wikipedia

    en.wikipedia.org/wiki/Output_Signal_Switching_Device

    An output signal switching device (OSSD) is an electronic device used as part of the safety system of a machine. It provides a coded signal which, when interrupted due to a safety event, signals the machine to shut down. It works by converting the standard direct current supply, usually 24 volts, into two pulsed and out-of-phase signals.

  6. Embedded pavement flashing-light system - Wikipedia

    en.wikipedia.org/wiki/Embedded_pavement_flashing...

    An embedded flashing-light system, or an in-pavement flashing-light system, is a traffic safety device installed at pedestrian crossings or intersections to enhance driver awareness of pedestrians or traffic signals. These systems typically consist of LED lights embedded within the road surface, positioned to face oncoming traffic or pedestrians.

  7. Signal lamp - Wikipedia

    en.wikipedia.org/wiki/Signal_lamp

    Signal lamp training during World War II. A signal lamp (sometimes called an Aldis lamp or a Morse lamp [1]) is a visual signaling device for optical communication by flashes of a lamp, typically using Morse code. The idea of flashing dots and dashes from a lantern was first put into practice by Captain Philip Howard Colomb, of

  8. Variations in traffic light operation - Wikipedia

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

    Washington state, particularly Seattle, used a flashing yellow ball in the left-turn signal for the same purpose. Seattle also used a four-lamp signal at about 20 locations, with a red ball, a steady yellow ball, a flashing yellow ball, and a dual-mode yellow and green arrow; during the permissive turn, the flashing yellow ball was displayed. [26]

  9. 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.

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