A wonderful idea,
it would keep all the tailgater's happy, they could see ahead who they were going to target NEXT.
Over here most of the cowboys ride a horse, and dont drive white windless vans, thats done by people who have a little hole in their bottom, others, with an extra long 2nd finger, and not forgetting the ones driving at least 30 km under the speed limit on the motorway in the fast lane....
Peter