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  2. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    Red and blue emergency lights on a fire engine in Canberra, Australia. 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 ...

  3. Emergency vehicle equipment - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_equipment

    Emergency vehicle equipment. An ambulance with two red revolving lights (beacons) mounted above two flashing red lights, with two speakers between for the vehicle's electronic siren. Also seen are two antennae; the one seen between the two speakers is for a two-way radio, while the one seen in front of the flashing light on the left is probably ...

  4. End-of-train device - Wikipedia

    en.wikipedia.org/wiki/End-of-train_device

    End-of-train device. The end of train device (ETD), sometimes referred to as an EOT, flashing rear-end device (FRED) or sense and braking unit (SBU) is an electronic device mounted on the end of freight trains in replacement of a caboose. They are divided into three categories: "dumb" units, which only provide a visible indication of the rear ...

  5. 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.

  6. Cessna Citation II - Wikipedia

    en.wikipedia.org/wiki/Cessna_Citation_II

    The Cessna Citation II models are light corporate jets built by Cessna as part of the Citation family. Stretched from the Citation I, the Model 550 was announced in September 1976, first flew on January 31, 1977, and was certified in March 1978. The II/SP is a single pilot version, the improved S/II first flew on February 14, 1984 and the ...

  7. Emergency vehicle equipment in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle...

    Electronic sirens have replaced two-tone horns on most emergency vehicles. Emergency vehicle equipment is used in the United Kingdom to indicate urgent journeys by an emergency service. This usage is colloquially known as "blues and twos", which refers to the blue lights and the two-tone siren once commonplace (although most sirens now have a ...