About time. I like to drive and wish to keep my liberty on the road as much as anyone else but I think it would be easy to send basic just-in-time telemetry to the other neighboring cars to improve cruise control, emergency braking and heavy traffic situations.

The car in front of you could easily send its exact speed, throttle/brake position. If it is following gps, it could broadcast the next turn on its route to help you predict its intentions (turn signals are often lacklusters or too complicated for some drivers)

In traffic, it could help stiffen the elastic by reducing the reaction time either by either telling the driver to get ready or accelerating for them.

The possibilities are infinite once you have a minimum of telemetry.