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  2. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    An LED 50-watt traffic light in Portsmouth, United KingdomTraffic lights, traffic signals, or stoplights – also known as robots in South Africa, [1] [2] Zambia, and Namibia – are signaling devices positioned at road intersections, pedestrian crossings, and other locations in order to control the flow of traffic.

  3. Variations in traffic light operation - Wikipedia

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

    In New Zealand, where they drive on the left, when a road is given a green light from an all direction stop, a red arrow can continue to display to turning traffic, holding traffic back while the pedestrian crossing on the side road is given a green signal (for left turns) or while oncoming traffic goes straight ahead and there is no permissive right turn allowed (for right turns).

  4. North American railroad signals - Wikipedia

    en.wikipedia.org/.../North_American_railroad_signals

    Triangularly arranged color light signals consist of a cluster of three color lamp sockets in the middle of a large circular target. They were one of the first widely used type of high intensity color light signal, notably adopted by the New York Central and Seaboard Coast Line railroads, and later used exclusively by Conrail and New Jersey ...

  5. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    One-color light is well suited for traffic lights and signals, exit signs, emergency vehicle lighting, ships' navigation lights, and LED-based Christmas lights. Because of their long life, fast switching times, and visibility in broad daylight due to their high output and focus, LEDs have been used in automotive brake lights and turn signals.

  6. Glossary of North American railway terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_North_American...

    A locomotive without cab signals that does not receive a C light at an interlocking may proceed past the signal not exceeding Restricted Speed, or with a Form D or other Track Warrant authorization. Cab car (US) A passenger coach which has a full set of train controls at one end, allowing for the use of push-pull train operation [58] Cab unit (US)

  7. 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.

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