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  2. Variations in traffic light operation - Wikipedia

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

    Flashing yellow arrow. [edit] Variations on the protected/permissive traffic signals in the United States; (1) is the "classic" doghouse five-light signal introduced in 1971; (2) and (3) incorporate flashing yellow arrows. In the US, a flashing yellow arrow is a signal phasing configuration for permissive left turns.

  3. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    Emergency vehicle lighting, also known as simply emergency lighting or emergency lights, is a type of vehicle lighting used to visually announce a vehicle's presence to other road users. A sub-type of emergency vehicle equipment, emergency vehicle lighting is generally used by emergency vehicles and other authorized vehicles in a variety of ...

  4. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    Traffic lights normally consist of three signals, transmitting meaningful information to road users through colours and symbols, including arrows and bicycles. The regular traffic light colours are red, yellow (also known as amber), and green arranged vertically or horizontally in that order.

  5. Traffic light control and coordination - Wikipedia

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

    A junction for road vehicles and pedestrians controlled by traffic lights in the UK. The various vehicle and pedestrian movements are separated in either time or space for safety and efficiency. The normal function of traffic lights requires more than sight control and coordination to ensure that traffic and pedestrians move as smoothly, and ...

  6. Yellow trap - Wikipedia

    en.wikipedia.org/wiki/Yellow_trap

    When a vehicle traveling on a road with two-way traffic is preparing to turn at an intersection and the intersection does not have a protected turn across oncoming traffic, the yellow trap may occur when the vehicle preparing to turn is given an amber light, while at the same time, traffic on the same road moving in the opposite direction still has a green light.

  7. Light characteristic - Wikipedia

    en.wikipedia.org/wiki/Light_characteristic

    Light characteristic. A light characteristic is all of the properties that make a particular navigational light identifiable. Graphical and textual descriptions of navigational light sequences and colours are displayed on nautical charts and in Light Lists with the chart symbol for a lighthouse, lightvessel, buoy or sea mark with a light on it.

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