For example, a car should refuse to let the driver proceed thru a light/stop sign unless it's clear. Imagine all the money that would be saved from property/medical damages.
If we could have a global infrastructure, wherein we tell the car the place we wish to visit, which causes the car to automatically figure out: the optimal route based on constantly changing traffic and weather conditions, refilling, obeying all rules such as one-way / speed limitations and so on, it will be truly amazing achievement.
The technology is there, fragmented in thousands of pieces; it needs to be weaved as a cohesive whole in a reliable and safe manner.
In a nutshell, save the time for driving the vehicles for an entire civilization, :)
Right now all the telematics stuff is broken in to pieces you could do a lot of neat stuff if they were better integrated. You could use that preemptive braking stuff to decide I am in traffic on an interstate an find a new route.(Hint if the speed limit is sixty and I am with in a few feet of the guy in front of me and my current speed is below 5mph I am in traffic and the gps system should reroute me.)