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i'm in the Uk and I find it works most of the time but its certianly not 100% accurate.
A road local to me is 30 mph but in one direction it states the speed limit is 20mph and ion te oterh direction its 60mph.
In his case I think teh erro is on the sat nav info as ehre are no road signs.
It can be caught out on roads where there is a speed limit sign for the road leading off, so speed limit might be 50mph on te dual carriage way and 30 for the road leading off, the camera sees 30mph and displays that.
It seems to have quite a wide angleof view the camera.
it would be interesting to know where at any given time the information is coming from, eiterh the sat nav data map or the camera. (Is that info hidden away in any hidden menues by any chance?)
At the end of the day you have to apply common sense and not rely on it 100%.
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