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  2. List of RAL colours - Wikipedia

    en.wikipedia.org/wiki/List_of_RAL_colours

    Green blue: RAL 5002: Ultramarine blue: RAL 5003: Sapphire blue: RAL 5004: Black blue: RAL 5005: Signal blue: RAL 5007: Brilliant blue: RAL 5008: Grey blue: RAL 5009: Azure blue: RAL 5010: Gentian blue: U8 line of the Berlin U-Bahn: RAL 5011: Steel blue: RAL 5012: Light blue: U7 line of the Berlin U-Bahn: RAL 5013: Cobalt blue: Deutsche ...

  3. Variations in traffic light operation - Wikipedia

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

    In New Zealand, where they drive on the left, when a road is given a green light from an all direction stop, a red arrow can continue to display to turning traffic, holding traffic back while the pedestrian crossing on the side road is given a green signal (for left turns) or while oncoming traffic goes straight ahead and there is no permissive right turn allowed (for right turns).

  4. Railway signal - Wikipedia

    en.wikipedia.org/wiki/Railway_signal

    Originally, signals displayed simple stop or proceed indications. As traffic density increased, this proved to be too limiting and refinements were added. One such refinement was the addition of distant signals on the approach to stop signals. The distant signal gave the driver warning that they were approaching a signal which might require a stop.

  5. If a red traffic light never turns green, can you run it ...

    www.aol.com/news/red-traffic-light-never-turns...

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  6. RAL colour standard - Wikipedia

    en.wikipedia.org/wiki/RAL_colour_standard

    RAL is a colour management system used in Europe that is created and administered by the German RAL gGmbH [1] (RAL non-profit LLC), which is a subsidiary of the German RAL Institute . In colloquial speech, RAL refers to the RAL Classic system, mainly used for varnish and powder coating , but now plastics as well.

  7. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    Popular in Vietnam and China, countdown lights are additional lights installed next to (or above or below) the main signal lights. The countdown light is displayed by a countdown number with different colors (usually red, yellow, green), matching the color of the light on. When the light counts to "0" (or 1), the main light color immediately ...

  8. Variable-message sign - Wikipedia

    en.wikipedia.org/wiki/Variable-message_sign

    Trailer-mounted variable-message signs are used to alter traffic patterns near work zones, and for traffic management for special events, natural disasters, and other temporary traffic patterns. The messages displayed on the sign can be programmed locally on the unit's control panel, or units equipped with a cellular modem can be programmed ...

  9. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    As a result of the "Verdunkelung", a black-out measure for aerial defense from 1935, cobalt blue was regulated to replace the red color used until 1938 in German emergency vehicle lights. [1] [2] Due to the scattering properties of the blue color, it is only visible to lower altitudes and is therefore less easily spotted by enemy airplanes.