Can't find s reference, but I remember in the 70's Loughborough or one of the Universities /Polytechnics had developed ultrasound to prevent tailgating.
The idea was that speed would be regulated to the distance from the car in front. It worked brilliantly and ensured safe braking distances without fault.......... until it went on the road. Th efirest outing a numpty pulled into the gap, car thought that the speed for thenew distance (only a few feet) was low and slammed anchors on accordingly
The problem is that you can only plan for the good drivers there is always the idiot you cannot plan for
The idea was that speed would be regulated to the distance from the car in front. It worked brilliantly and ensured safe braking distances without fault.......... until it went on the road. Th efirest outing a numpty pulled into the gap, car thought that the speed for thenew distance (only a few feet) was low and slammed anchors on accordingly
The problem is that you can only plan for the good drivers there is always the idiot you cannot plan for