Apple has grown its fleet of self-driving cars from just three when the program started in April 2017 to a whopping 45 as of its most recent filings, The Financial Times reports. Those filings for legal purposes are the only indication Apple has given that the program even exists, and even sources inside the company still aren’t sure what final form of self-driving technology Apple may eventually offer to consumers, if any. Since Apple is so secretive about the project, it’s also unclear if the company has made any changes after a self-driving Uber vehicle killed a pedestrian earlier this week. Like Uber, Apple requires a human operator inside the vehicle during testing for safety purposes, but it’s unclear if the Uber driver even had time to react to the pedestrian who was killed. Uber has temporarily suspended its own testing in wake of the death, but preliminary reports seem to indicate the pedestrian was at fault in the accident.