Apple seems to be ramping up its autonomous vehicle efforts, nearing doubling the number of vehicles in its fleet since January.

The company now has 45 autonomous vehicles in California registered with the DMV, according to the Financial Times. This makes Apple’s AV fleet the second largest in the state of California, outsized only by General Motors.

In April 2017, Apple received its first permit to test three autonomous vehicles. By January of this year, the company was testing 27 autonomous vehicles, and in just two months the company has nearly doubled its efforts, with plans to start testing vehicles in Arizona.

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