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What happens to the traffic signals when a fire truck goes through a signalized intersection?

April 26, 2017happens INTERSECTION signalized signals Traffic truck

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What happens to the traffic signals when a fire truck goes through a signalized intersection?

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City fire trucks are equipped with a device which “pre-empts” normal operation of the traffic signals. During a pre-emption, a green indication is given to the signal movement, which the emergency vehicle is utilizing.