Google's popular self-driving car was pulled over by the police for driving too slowly in Mountain View, Calif., according to CNN.

A Mountain View police officer pulled over the autonomous vehicle Thursday for driving 24 miles per hour in a 35 mph zone, reported CBS SF Bay Area.

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

The autonomous car had a passenger inside ready to take control of the car by stepping on the brake or turning the wheel in case of an emergency. In this case, the passenger spoke on behalf of the smart car. 

The Mountain View officer questioned the passenger and then contacted its operators to tell them that the car was impeding traffic on El Camino Real Street.

The officer did not give the Google car a ticket, CNN noted. He instead told the passenger that according to 22400(a) of the California Vehicle Code, the autonomous driving car was slowing down traffic by driving below the rated speed limit.

The Google project responded in a blog post, writing, "Driving too slowly? Bet humans don’t get pulled over for that too often.”

"After 1.2 million miles of autonomous driving (that's the human equivalent of 90 years of driving experience), we're proud to say we've never been ticketed!" the Google project wrote.

Google added the the self-driving smart cars' record of traveling for 1.2 million miles, which is equivalent to a human's driving experience of 90 years, remains untouched.

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