[botsapper]

The proposal has a design criteria with a very limited scope: a visual display of a 'suggested' vector quantity, acceleration or slowing/braking in a traffic light-controlled environment. Similar to mpg arduinos/mpg gauges, the driver still maintains control for best mpg/speed range.

It may be great in practice but can foresee the unfortunate litigious US easily derail the device/app. Any nefarious litigant involved in a accident could 'blame' the device; for leading them to speed up into a 'going red' intersection, to aggressively pass slower vehicles to maintain 'best' average speed, and the countdown to green, like Christmas tree - an invitation to drag!