You friend says that one way to improve air quality in a city is top have the traffic lights synchronized so that motorists can travel long distances at constant speed. What physics principle support this claim? Explain why.

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Problem 1AYK: Do highway speed limit signs refer to average speeds or to instantaneous speeds? Explain.
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You friend says that one way to improve air quality in a city is top have the traffic lights synchronized so that motorists can travel long distances at constant speed. What physics principle support this claim? Explain why. 

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