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An Amphometer is a device that is used to measure the passage of a vehicle. From it, the time taken to pass over a set distance can be calculated and the speed derived. It is sensitive to the direction of travel so can be used as a vehicle counter for traffic management.It uses air filled tubes connected to switches. The vehicle passage compresses the air, actuating the switch connected to the end of the tube. One tube starts the timer, the other stops it.

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Q: What does an amphometer measure?
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