Will robot cars drive traffic congestion off a cliff?

FILE - In this May 13, 2014 file photo, a Google self-driving car goes on a test drive near the Computer History Museum in Mountain View, Calif. Self-driving cars are expected to usher in a new era of mobility, safety and convenience. The problem, say transportation researchers, is that people will use them too much. (AP Photo/Eric Risberg, File)WASHINGTON (AP) — Self-driving cars are expected to usher in a new era of mobility, safety and convenience. The problem, say transportation researchers, is that people will use them too much.

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