Automakers Enter ‘Gray Zone’ as They Roll Out Semi-Autonomous Tech
<p>As the big Mercedes-Benz sedan roars down U.S. 101 south of San Francisco, it closes on an old pickup truck cruising along in its lane. The driver flicks the turn signal for a pass but then, unexpectedly, takes his hands off the wheel. The new sedan pauses for two seconds and then completes the maneuver on its own.</p>
