On Tuesday, the sources said, "Apple has almost doubled the number of self-driving cars in its California test fleet". At this stage, Apple hasn't been authorized to test self-driving cars independent of human supervision; for that, the company will need to submit a separate permit to the DMV - something Waymo did last month.
We do know that the autonomous auto scene is heating up - Tesla and Drive.Ai are lagging behind Apple, but fellow California-native GM Cruise leads the pack with 104 vehicles with self-driving capacity. The company first received a permit to test autonomous vehicles in the state last April, starting with only three Lexus Rx450h SUVs. Waymo has 51 cars in the state, but also has 338 registered drivers.
Apple's 55-vehicle fleet is the second largest in California, behind only Cruise, a self-driving company owned by GM, which sports a 104-strong fleet. That puts it four cars ahead of the latest figures we have for Waymo, Alphabet's self-driving auto division thought to be among the leaders in the sector.
The tight-lipped tech giant has rapidly built up its self-driving auto program, known as Project Titan, since gaining a testing permit in April of previous year.
Uber left California in late 2016, taking its 16 vehicles with it, after the California DMV threatened to revoke its vehicle registrations.
Apple still hasn't publicly announced its plans when it comes to autonomous cars.
Chief Executive Officer at Apple, Tim Cook called self-driving a core technology that we view as very important.