Sorry, I know these threads are done to death but I was rolling along in an 80kph limit earlier, middle of nowhere, long straight road. Started to brake for a 60 kph limit and possibly rolled past the sign at just over the limit, still braking (watching the road, not the clock). The van was 200-300m away. I was probably ok, but the question is, do the detect from the point the sign is mounted or say 50m into the limit? What is the tolerance on the actual speed? I braked harder obviously when I saw it but wondering at what point I'd have been clocked. Responsible driver with 23 years with a 100% clean record so it would be a bad way to end it. Any thoughts?