Robot racing gets under way

It's the ultimate robot reality show: 43 contestants battling for a spot in a government-sponsored desert race intended to speed development of unmanned military combat vehicles.

The reward? A $2 million cash prize.

The autonomous robotic vehicles began competing Wednesday in the first of a series of qualifying rounds at the California Speedway. Half will advance to the October 8 starting line of the so-called Grand Challenge.

The grueling, weeklong semifinals are designed to test the vehicles' ability to cover a roughly 2-mile stretch of the track without a human driver or remote control.

Participants ranging from souped-up SUVs to military behemoths will be graded on how well they can self-drive on rough road, make sharp turns and avoid obstacles -- hay bales, trash cans, wrecked cars -- while relying on GPS navigation and sensors, radar, lasers and cameras that feed information to computers.