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A LIDAR test vehicle of sensor maker Velodyne drives through a California street.
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GPS and radio antennas on the roof of Stanford University's autonomous driving test vehicle.
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An autonomous driving test vehicle sits in a garage workshop at Stanford University in California.
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This Nissan test vehicle, on show at Ceatec 2012 in Japan, is able to park itself.
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What the LIDAR sees. This image, taken from a LIDAR sensor mounted on the roof of a car, shows a downtown street in California. Other vehicles, buildings and objects are visible.
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A Lexus car outfitted with autonomous driving sensors and systems, on show at CES 2013 in Las Vegas in January 2013.
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Sergey Brin speaks during an autonomous vehicle event at Google headquarters in Mountain View in September 2012
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Cars on the 101 freeway in Silicon Valley
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Cars on the 101 freeway in Silicon Valley
Driverless cars yield to reality: It's a long road ahead
9 Photos
Several automotive and tech groups are researching the technology, but a fully self-driving car could be far off
