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At a constant speed the Road Angel has a more accurate speedometer reading than that of the car. This is because the speedometer readout is governed by the rolling circumference of the tyre in contact with the road surface. Different tyre pressures, sizes and tread ware can all make a difference to the speedometer reading. For this reason every manufacturer has to calibrate the speedometer to ensure that at no point can the vehicle be traveling faster than is indicated.
The Road Angel speed lags because it checks it's position once a second, there will always be a delay under acceleration and deceleration.
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