Why do police cars have certified speedometers, while civilian cars do not?
In: Engineering
In addition to all the other comments about cops needing to have an accurate speedo in order to measure other cars’ speeds: uncertified speedos tend to skew towards reading high. If your speedo says you’re doing the speed limit, chances are you’re a little under it. If you are actually speeding, the speedo will say you’re going even faster again.
If a police speed read high like this, they would overestimate the speed that they (and the car they’re following) is going, resulting in potentially issuing fines to people who were not speeding.
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