States Wire Up Roads as Cars Get Smarter – Wall Street Journal

Posted: Monday, January 02, 2017

FAIRFAX, Va.—On a crowded interstate outside Washington, D.C., large digital signs over four westbound lanes flashed messages lowering the speed limit by 10, then 20 miles an hour.

Drivers slowed just as a fast-moving thunderstorm unleashed sheets of rain that drenched the road and reduced visibility to a few dozen yards. There was no abrupt braking, no swerving and none of the fender-benders that can tie up traffic for miles.

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