The speed bands show 1mph above as the penalty trigger.
31 for a 30 limit etc..
It will be interesting to see if any discretion will apply as can happen now. The 10%+2 mph theoretical band where SAC can be offered if no previous within the timescale. There have been murmurings about zero tolerance.
It could pose issues for accuracy of speedometers and cruise control. The cameras are calibrated to accuracy standards but how many speedometers are matching that standard?
