Traffic congestion can be ameliorated significantly if cars are able to form
virtual trains through communication. Instead of every car needing a 3-10 times
their own length for stopping safety, the cars in the communicating
"train" can close up the distance safely while still maintaining the
speed of the wider spacing. That equals more cars in the same space
and faster transit so that more cars can use the same space in the time allowed.
This is much cheaper than building additional road surface. And the cost is
automatically spread among all the users because each car is purchased/leased
individually with the requisite technology built into the car.Work
on these technologies remains including how to make the decisions about train
building and distance for communication, but several companies are attacking the
problems from different directions. Volvo and Mercedes have been working on it
in Europe from the viewpoint of car flexibility and Google has been working on
it from the direction of driver flexibility.