what are speed limits on different types of road, and why do they exist? how do we calculate stopping distance? compare the…

what are speed limits on different types of road, and why do they exist? how do we calculate stopping distance? compare the stopping distance of a car at 20mph, 40mph and 60mph (give specific values if possible) what factors affect stopping distance? what are speed cameras and why do we use them? do speed cameras really work? what are anti-skid surfaces and why do we use them?
 
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