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Currently, the dark grey patch on the image is where Apple is currently located at Infinite Loop, Cupertino, CA. Around three-four times larger in space, the proposed site for the Apple Campus 2 is shown in red. It's no more than a 10 minute drive down the road.
Apple notes a 'before' and 'after' view (left-right, respectively) which shows a perimeter-like public access around the campus. There are numerous ways into the campus, but three major entrances for staff.
The actual campus itself will not be open to the public and only opened on rare occasions such as to allow members of the press and media through. Even then, they will have to pass through security buildings.
Apple's revised campus plans pushes the main campus building -- shaped like a donut -- away from the main roads and public highways in order to reduce noise, but also to increase privacy. This means photographers will find it more difficult to long-lens employees, for instance.