A Google self-driving car was pulled over Thursday for driving too slow near its headquarters in Mountain View, California.

According to the Mountain View Police Department (MVPD), an officer observed regular traffic slowing down on El Camino Real near Rengstorff Avenue.

That intersection is about 2.3 miles from Google’s headquarters.

The police wrote in a statement that the car was traveling 24mph in a 35mph zone.

As the MVPD wrote:

As the officer approached the slow moving car he realized it was a Google Autonomous Vehicle. The officer stopped the car and made contact with the operators to learn more about how the car was choosing speeds along certain roadways and to educate the operators about impeding traffic per 22400(a) of the California Vehicle Code. The Google self-driving cars operate under the Neighborhood Electric Vehicle Definition per 385.5 of the California Vehicle Code and can only be operated on roadways with speed limits at or under 35 mph. In this case, it was lawful for the car to be traveling on the street as El Camino Real is rated at 35 mph. The Mountain View Police Department meets regularly with Google to ensure that their vehicles operate safely in our community.

Google, for its part, wrote in its own post that the company has capped its prototype vehicles at 25 mph.

The company added: “Like this officer, people sometimes flag us down when they want to know more about our project. 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!”