Volvo study shows driver-assistance, self-driving features will make cars more efficient

Volvo XC90 self-driving car prototypeSelf-driving cars are green cars, not just because they are usually electric. One of the biggest reasons engineers began working on self-driving cars more than a dozen years ago was for their efficiency, reducing stop-and-go driving and eventually even stoplights. (Potential safety improvements are another big motivation.) Now, a study by the...