There's also the worrying thought of everyone in the middle and outer lane of a motorway doing 70mph and ending up nose to tail, so the system will also need to enforce appropriate braking distances- so it will have to work out if the road is wet or dry, or even icy. Then it also has to cope with working out if the driver is nodding off from boredom and if that is the case, what does it do? Slow down? Chaos beckons
Mike