Like other tech giants, Apple is keen to get into the auto space, with Tim Cook previous year saying that autonomous systems are "a core technology" that the company views as "very important".
Apple's self-driving auto program has seemed for years to be one of the industry's worst-kept secrets. "Apple is second only to General Motors which performs tests with Cruise - its self-driving division".
There are 409 total self driving cars.
Behind Apple lags Waymo, which has 51 vehicles registered in California, and Tesla, which has 39 vehicles. Sources said that Uber along with Waymo used to have a more autonomous vehicle in California, for instance, both have over 100 self-driving cars in the state before moving part of its fleet to Arizona where additional testing is now taking place.
Oil jumps after U.S. abandons Iran deal, plans 'highest level' sanctions
She said the move may not only anger USA citizens but allies overseas who have urged Trump to stay in the nuclear agreement. OPEC also boosted its forecast for demand this year while trimming its outlook for global oil production.
F1: Vettel falls 17 behind Hamilton
The Ferrari driver led the title bid in style two races ago, and slipping back appears to have brought out his kamikaze side. They rediscovered it around the long sweeps of the 4.6-kilometer long track and unleashed it to devastating effect.
EasyJet beefs up package holidays and loyalty scheme as losses narrow
Wilson previously worked at TUI AG, the world's biggest tour operator, where the CEO himself was also once a senior executive. Analysts had predicted a loss of 74 million pounds, based on four estimates.
It's important to note that companies like Waymo and Uber used to have more self-driving cars in California. However, those numbers may be somewhat misleading, since other companies are testing their self-driving fleet in other parts of the U.S.as well.
Uber left California in late 2016, taking its 16 vehicles with it, after the California DMV threatened to revoke its vehicle registrations.
Apple's mysterious fleet is perhaps one of the biggest secrets the company has held, and the company has yet to confirm this new report.
At present, Apple has 55 self-driving vehicles that it is testing on public roads. "It's probably one of the most hard AI projects actually to work on".
So, we know that Apple has cars and safety drivers, what we don't know is what exactly its been doing with them.