^^This is correct,
BUT there are also line metal markings on the road itself.
They are like metal bars - almost like a gridlock and when your tyres roll over these they have sensors which determines your speed which then triggers the flash/camera to activate.
These gridlocks/or metal lines are also on the fixed speed cameras - especially where the fixed cameras have the school zones.
they are more accurate than these boxes at the intersection - there is no escape on the lines too once your wheels go over it your it! in any lane watsoever, unlike boxes they can be blocked by Huge Rig trucks etc.
next time i drive past one, ill pull over and take a snappy shot. so that everyone know what im talking about.
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