IME camera based detection is 'good' at spotting the signs/reading the limits but they usually lack any awareness/context of the sign, so picking up badly placed sideroad / slip road speed limits is one of the problems, most haven't solved that well..
Mine is usually pretty good, but there is one section near me where the old road was 50 and the new replacement road 70 and it persistently displays 50, occasionally it'll flick up 70 on the repeater signs and then immediately revert to 50 for some reason.
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