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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. All-way stop - Wikipedia

   en.wikipedia.org/wiki/All-way_stop

   Where a stop has been determined to qualify, it is signed at all approaches to the intersections with a standard octagonal "Stop" sign, with a supplemental "All-Way" plate. Earlier editions of the MUTCD allowed supplemental plates specifying the number of approaches in an all-way stop, as in "2-Way", "3-Way" or "4-Way".

4. Road signs in the United States - Wikipedia

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

   Stop sign ahead. W3-2 Yield sign ahead. CW3-2 Yield sign ahead. W3-3 Traffic light ahead. ... Steel plate ahead. W8-25 Shoulder ends. CW8-25 Shoulder ends. W8-26 Road ...

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6. 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.

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 ...