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The Eastern Market in Washington, D.C., was damaged by a three-alarm fire in 2007 [1] New York City's Serbian Orthodox Cathedral of St. Sava was mostly destroyed by a four-alarm fire in 2016 [2] One-alarm fires, two-alarm fires, three-alarm fires, etc., are categories classifying the seriousness of fires, commonly used in the United States and ...
The basic signal consists of flashing red lights, a crossbuck and an alarm (either a bell, a speaker that mimics a bell sound or an electronic siren), attached to a mast. At most crossings, the signals will activate about 30 seconds before the train arrives but there are sensors measuring speed so that the crossing knows when to activate; so ...
These flashing red arrows were later replaced with flashing yellow arrows. Dover, Delaware used a four-lamp signal. Forming a T, it has a flashing red arrow on the left, a steady red arrow on the right and yellow and green arrow on the bottom; during the permissive turn, the flashing red arrow is displayed.
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Engineers also need to set the amber timings (and red–amber, where appropriate), which is normally standardised by a traffic authority. For example, in the UK, the amber time is fixed nationally at three seconds and the red–amber time at two seconds, which results in a minimum intergreen time of five seconds (plus any all-red time). [19]
an alarm clock that sounds an alarm at a pre-set time, often used to wake a person up or remind them of an event. a fire alarm which is used to give occupants of a building early warning of a potential fire and give them time to evacuate. warning devices on a vehicle that sound when it is moving in an unexpected direction, such as reversing,
Many modern fire alarm pull stations are single-action and only require the user to pull down a handle to sound the alarm. Other fire alarm pull stations are dual-action, and as such require the user to perform a second task before pulling down, such as lifting or pushing in a panel on the station or breaking a glass panel with an attached hammer.
A mysterious light has been blinking in space every 21 minutes for 35 years–and scientists have no idea what it is. What could it be?