Google’s autonomous car fleet is undergoing a major expansion. In the last month, the number of cars it is permitted to drive on public streets has more than doubled, and Google now accounts for more than half of the driverless cars that are legal in California.

As of Wednesday, the company has been issued 48 permits for driverless vehicles, according to records at California’s Department of Motor Vehicles. About a month earlier, on May 15, Google held just 23 permits.

The additional 25 permits are for a new fleet of prototype cars that are undergoing testing on private roads, the company said. The cars, tiny two-seaters, are designed for neighborhood driving and have a top speed of 25 miles per hour. They’ll be hitting public streets some time over the summer near Google’s headquarters in Mountain View.

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