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What is Speed?
Speed(s) is the distance travelled divided by the total time it took to get from the starting point to the ending point, or:
s=(Dx)/(Dt)
How does the speedometer work?
Your vehicle's speedometer determines your speed by examining the angular velocity(v) of your axle (how fast your axle spins) and multiplying it with the manufacturers' recommended circumference for the vehicle's tires. (This is why using oversize tires will cause your speedometer to register a lower speed than your actual travelling speed-the circumference of the oversize tires is greater than that of the recommended tires, while the angular speed remains the same) So, in application:
s = v*2pr
Why should we limit our speed?
Speed limits are designated for roads based on the roads characteristics such as its geometry and capacity, and traffic characteristics such as overall volume, hourly volume and traffic density. Speed limits are designed to most effectively and safely regulate traffic.
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