I was told recently by a friend whos friend's Dad works for something to do with the cameras, that the cameras can only lock onto a vehicles plate in their mapped out lane. So apparently if you're dead on the line (although I can't see them mapping the cameras to the lane lines perfectly) then neither of the cameras will get you... but it's a big risk as you have to be dead on the centre so half your plate is in one lane and half in the other in order for neither to lock onto you're plate.