For the last portion of the challenge, the robots will be balanced on the bridges in the middle of the field in order to score additional points.

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In November, DARPA put street-level robots to the test in its Urban Challenge, a race of 12 autonomous cars through simulated city streets populated by obstacle cars.

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When the final round of the Urban Challenge begins Saturday morning, that field will have been whittled down to just 20 or so robots by the event's sponsor, the Defense Advanced Research Projects Agency (DARPA).

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