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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...

    The left turn signal head operates independently from the signals for straight through traffic. This allows permissive turning even when straight through traffic is shown a red light, avoiding yellow trap. Louvers are fitted over the green and yellow balls of the left turn signal head to prevent driver confusion.

  4. Traffic light control and coordination - Wikipedia

    en.wikipedia.org/wiki/Traffic_light_control_and...

    After the newer generations of traffic signals that use LED lights which consume 85-90% less energy, it is now possible to incorporate battery backups into the traffic light systems. The battery backups would be installed in the traffic controller cabinet or in their own cabinet adjacent to the controller.

  5. North American railroad signals - Wikipedia

    en.wikipedia.org/.../North_American_railroad_signals

    The signal's aspect is based on a combination of the aspects each individual head displays. Where a signal has multiple heads, aspects are read from top to bottom and are described as "X over Y over Z". Dwarf signals are smaller signals used in low-speed or restricted-clearance areas. Most signaling aspect systems have a parallel set of aspects ...

  6. HAWK beacon - Wikipedia

    en.wikipedia.org/wiki/HAWK_beacon

    Unlike ordinary traffic signals, the vehicular signal heads of a HAWK beacon are unlit until activated by a pedestrian who wishes to cross the roadway. The pedestrian signal heads operate normally, displaying an upraised hand (don't walk) aspect during the time that vehicles have the right of way . [ 4 ]

  7. Hilton Head’s new traffic signal won’t impact morning rush ...

    www.aol.com/hilton-head-traffic-signal-won...

    Friday will be the test for morning rush hour for traffic going on to Hilton Head Island ... A worker with W.M. Roebuck Inc. installs a traffic signal at the intersection of U.S. 278 at Windmill ...

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