Oh public records — you make it so hard to do things in complete secrecy. It seems the rumored Apple self-driving car is in fact an actual project and the company is looking to utilize a private testing facility to work on the project.
The video in the article linked below shows Honda (Acura) using the facility North of San Francisco called GoMentum Station, a testing and research facility on the previous site of the Concord naval weapons station.
Documented Proof of Apple Car Project Emerges