Robotic cars driving inside city limits

Seven months after an unmanned Volkswagen successfully drove itself over the rugged Mojave Desert, the Pentagon is sponsoring another challenge for self-driving vehicles that can weave through congested city traffic without causing an accident.

The contest, to be held in November 2007, will test the vehicles' ability to independently carry out a simulated military supply mission in an urban setting in less than six hours.

The Pentagon's Defense Advanced Research Projects Agency, or DARPA, created the latest challenge to spur development of vehicles that could be used in the battlefield without any sort of remote control.

Participants will have to navigate a complex 60-mile test course in a yet-to-be-determined city filled with moving vehicles -- both manned and unmanned. The test course will be designed like a real city street where vehicles will have to make sharp turns, navigate intersections and avoid crashing into obstacles such as utility poles, trees and parked cars.

Equipped only with a computer brain and sensors, the participants will be graded on how well they can obey traffic laws, change lanes, merge with moving cars and pull into a parking lot.

The first vehicle that successfully completes the mission will win $2 million with second-place finishers claiming $500,000 while third place will receive $250,000.

Last October, the agency awarded $2 million to a driverless Volkswagen SUV, which beat out a field of 23 vehicles by traversing 132 miles of twisting desert and mountain terrain. While the vehicles had to drive on rough road and dodge man-made obstacles, they didn't have to drive in traffic.

''We believe the robotics community is ready to tackle vehicle operation inside city limits,'' DARPA Director Tony Tether said in a statement.

Stanford University computer scientist Sebastian Thrun, who won last year's race, said he was excited to see the agency take the challenge to the next level. Thrun said the artificial intelligence knowledge gained from the contest could also benefit society by pushing the development of ''smart cars'' that can self-navigate on highways and potentially reduce accidents.

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