Want to Triple Highway Capacity? Put Robot Cars on the Road

A paper being presented this week at an Institute of Electrical and Electronics
Engineers (IEEE) conference on vehicular technology concludes that "by banding together into groups, driving much closer to one another than
humans do, and working out the best possible solution to things like
merging and changes in traffic," self-driving cars could dramatically increase the efficiency of the nation's highways. Other recent research supports the conclusions of the paper's author, Patcharinee Tientrakool of Columbia University. 

"However far off it may be, transit officials are probably impatient for
that day," writes Coldewey. "Doubling or tripling the capacity of the highways without
spending billions on new lanes and other considerations is a city
planner's dream - to say nothing of the commuters, whose trip to work
would be shorter, safer, and easier."