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  2. Road traffic control device - Wikipedia

    en.wikipedia.org/wiki/Road_traffic_control_device

    The red light means that the vehicle facing the traffic light must come to a complete stop. A green light means that the vehicle facing the traffic light may proceed when it is safe to do so. A yellow light indicates that a red light will follow, and vehicle drivers must stop if it is safe to do so. Flashing beacons are flashing signals.

  3. Help Flash - Wikipedia

    en.wikipedia.org/wiki/Help_Flash

    Help Flash is a signaling device for road safety to be used in the event of breakdowns, accidents or when vehicles need to stop on the road. It has been a pioneer among official V16 warning beacon lights, the emergency light signals for automobiles. It stands out from other beacons due to its automatic ignition by magnetism: the flashing light ...

  4. HAWK beacon - Wikipedia

    en.wikipedia.org/wiki/HAWK_beacon

    At moveable bridges, which must be treated as stop and stay. The MUTCD states if two horizontally aligned red signal indications are used on an approach for an intersection control beacon, they shall be flashed simultaneously to avoid being confused with grade crossing flashing-light signals (e.g. railroad crossings).

  5. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    In the US, a single-aspect flashing amber signal can be used to raise attention to a warning sign and a single-aspect flashing red signal can be used to raise attention to a "stop", "do not enter", or "wrong way" sign. [32] Flashing red or amber lights, known as intersection control beacons, are used to reinforce stop signs at intersections. [33]

  6. Road signs in the United States - Wikipedia

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

    Emergency signal - stop on flashing red (overhead) R10-14b ... Light rail transit approaching sign (Activated, blank-out) W10-8 Trains may exceed (speed) W10-9

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  8. Variations in traffic light operation - Wikipedia

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

    Red lights supplement stop signs on the side road approaches. All-way red flashing lights can supplement all-way stop control, but all-way yellow signals are prohibited by US regulations. In Canada a flashing yellow light at an intersection that would otherwise have traffic signals indicates that the traffic signals are malfunctioning.

  9. A Mysterious Light Has Been Blinking in Space Every 21 ... - AOL

    www.aol.com/lifestyle/mysterious-light-blinking...

    A mysterious light has been blinking in space every 21 minutes for 35 years–and scientists have no idea what it is. What could it be?

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