At an intersection, there is a special traffic signal just for bicycles that allows them a protected

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Question:

At an intersection, there is a special traffic signal just for bicycles that allows them a protected left turn. The bicyclists' turn signal is triggered when a plate in the road detects a weight between 75 and 525 pounds. a) What is the tolerance of the weight plate? b) Why is the tolerance of the weight plate so high? c) Why would there be an upper limit on the weight plate?