this post was submitted on 18 Oct 2025
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There’s a little more to it than that. They also need to consider that, in cars with an analogue speed dial, the actual speed is not displayed precisely. Plus, there may be minor discrepancies between the speed dial and the actual speed, which can be affected by non-standard tyres etc. So a small “buffer” in acceptable speeds is pretty reasonable.
I recall being told by someone at a Mitsubishi factory that car manufacturers actually intentionally set the speed dials to be slightly higher speed than reality to accommodate for people’s need to break the rules just a little…!
Can confirm the last part.
Almost every car with speed control set to, for examole, 50 kph was metered at 45kph on GPS.
I was also told it's about the calibration of the radar guns. They are calibrated to -7/+0 meaning if you are going 47 mph there is a chance you are picked up as going 40. That said if you are going 41 or 42 there is a good chance the cop picks you up as going less than 40.
That I understand, but as the person I replied to said that I hope you read, people intentionally go 50 in the 45.
So the grace window you mention is irrelevant; you'd be doing 51 in the 45.