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  2. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    The four bulb Beacon Ray Model 175 with a clear dome and colored lenses over the bulbs were used extensively in the 1960s by the NYPD with two red bulbs alternated with a white bulb and an amber bulb canted upwards at a 45-degree angle so the amber flash would reflect off upper-floor building windows for added traffic attention/visibility.

  3. Non-detection at traffic lights in the United States - Wikipedia

    en.wikipedia.org/wiki/Non-detection_at_traffic...

    When this occurs, the small vehicle may fail to receive the right of way when the traffic light controller skips their phase, such as at traffic lights that are programmed to remain green for the main street and to only service minor movements, such as the side street or a main street left turn lane, on an as-needed basis when there is demand.

  4. Traffic signal preemption - Wikipedia

    en.wikipedia.org/wiki/Traffic_signal_preemption

    Traffic signal preemption (also called traffic signal prioritisation) is a system that allows an operator to override the normal operation of traffic lights.The most common use of these systems manipulates traffic signals in the path of an emergency vehicle, halting conflicting traffic and allowing the emergency vehicle right-of-way, thereby reducing response times and enhancing traffic safety.

  5. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with no lights or sirens. The term "Code 4" is also occasionally considered a response code, though it generally only means "call has been handled or resolved, no further units respond". Certain agencies may add or remove certain codes.

  6. Emergency vehicle equipment - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_equipment

    An ambulance with two red revolving lights 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 for the vehicle's conventional AM/FM radio.

  7. If You See a Red Porch Light, This Is What It Means - AOL

    www.aol.com/lifestyle/see-red-porch-light-means...

    What do people think red porch lights mean?. Back in 2016, a satirical website claimed that red lights on porches meant the home was gun-free. That’s a hoax, urban-legends site Snopes points out.

  8. William Potts (inventor) - Wikipedia

    en.wikipedia.org/wiki/William_Potts_(inventor)

    William Potts (May 1883 – 1947) was a Detroit police officer who is credited with inventing the modern, three-lens traffic light in Detroit in 1920. (A gas-powered, two-lens, red/green traffic signal was invented in London in 1868 by John Peake Knight, though after a short test installation, traffic lights were not seen again in the U.K. until 1929.) [1]

  9. Michigan State Police - Wikipedia

    en.wikipedia.org/wiki/Michigan_State_Police

    [citation needed] Fully marked patrol vehicles feature a single red overhead light, the RV-26 or RV-46 "Spitfire" made by Unity but however in mid to late 2023 they announced a new gumball light by Soundoffsignals Manufacturing that rotates when activated; however, in late 2009, MSP announced that these are being retrofitted with red LED lamps ...

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