Ten days later, a Mountain View motorcycle cop noticed traffic stacking up behind a Google car going 24 miles an hour in a busy 35 mph zone. He zoomed over and became the first officer to stop a robot car. He didn’t issue a ticket -- who would he give it to? -- but he warned the two engineers on board about creating a hazard.

There is a California traffic regulation that says "neighborhood electric vehicles" of which the google car was one, are limited to 25 mph max and are allowed to drive on roads with a 35mph limit.

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