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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 ...
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 ...
There are two main types of signaling aspect systems found in North America, speed signaling and weak route signaling. [citation needed] Speed signaling transmits information regarding how fast the train is permitted to be going in the upcoming segment of track; weak route signaling transmits information related to the route a train will be taking through a junction, and it is incumbent upon ...
Sirens are used on emergency service vehicles such as ambulances, police cars, and fire engines. There are two general types: mechanical and electronic. Many fire sirens (used for summoning volunteer firefighters) serve double duty as tornado or civil defense sirens, alerting an entire community of impending danger. Most fire sirens are either ...
In 1927, Griswold introduced the rotating banner signal. This was a unique combination of highway flasher and rotating stop sign (similar to a school bus stop sign). An approaching train would trigger not just the requisite red flashing lights and bells, but a mechanism that rotated a yellow stop sign ninety degrees to face traffic as well.
A Mars Light is mounted in the lower lamp housing on this EMD F7 diesel locomotive. More detail can be seen at high resolution. Mars Lights are signal-safety lights used in the United States and built by Mars Signal Light Company for railroad locomotives and firefighting apparatus. Mars Lights used a variety of means to cause the light to ...