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  2. Stop sign - Wikipedia

    en.wikipedia.org/wiki/Stop_sign

    The stop sign is retroreflective and equipped either with red blinking lights above and below the stop legend or with a legend that is illuminated by LEDs. Unlike a normal stop sign, this sign indicates a two-way absolute stop, requiring other vehicles travelling in both directions to remain stopped until the sign is retracted. [citation needed]

  3. Traffic sign design - Wikipedia

    en.wikipedia.org/wiki/Traffic_sign_design

    These non-permanent temporary signs are erected to warn drivers of unexpected conditions such as road work zones, diversions, detours, lane closures and traffic control. Often these signs are portable and can also be digital variable message signs. [1] In the United States, these signs are typically orange in color.

  4. Road traffic control device - Wikipedia

    en.wikipedia.org/wiki/Road_traffic_control_device

    These signs are generally rectangular in shape and use white, black and red/or as their primary colors. Warning signs are traffic signs that are used to warn road users about a potential danger. These signs are usually diamond in shape and, except for temporary traffic control signs, have black legends and borders on a yellow background.

  5. Road signs in the United States - Wikipedia

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

    Signs including Stop, Yield, No Turns, No Trucks, No Parking, No Stopping, Minimum Speed, Right Turn Only, Do Not Enter, Weight Limit, and Speed Limit are considered regulatory signs. Some have special shapes, such as the octagon for the Stop sign and the crossbuck for railroad crossings.

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  7. History of traffic lights - Wikipedia

    en.wikipedia.org/wiki/History_of_traffic_lights

    The gas lantern was manually turned by a traffic police officer with a lever at its base so that the appropriate light faced traffic. [7] The signal was 22 feet (6.7 m) high. The light was called the semaphore and had arms that would extend horizontally that commanded drivers to "Stop" and then the arms would lower to a 45 degrees angle to tell ...

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