Story highlights Car was doing 24 in a 35 mph zone

With no driver, officer spoke to the passenger instead

Google says its self-driving cars have never been ticketed

(CNN) No driver? No ticket.

That, at least, was the result when a police officer pulled over one of Google's self-driving cars Thursday in Mountain View, California.

The car wasn't speeding. On the contrary, it was driving too slowly -- 24 miles per hour in a 35 mph zone, according to the Mountain View Police Department -- with traffic apparently backing up behind it.

"As the officer approached the slow moving car he realized it was a Google Autonomous Vehicle," a police department post said.

Which is to say that no one was driving the darn thing.

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