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As members of the general public will not be allowed onto the Apple campus, a new pedestrian route will be necessary to implement, considering the campus will no longer be split into two by a road. Much of the pedestrian route is covered by a cycling route also.
You can see from the building distribution and property ratios that Apple's campus is further away from the road -- and therefore the general public -- giving the company secrecy in what it does, and its employees privacy to work as they will -- but also making the area more attractive and lush with natural elements.
The existing "absorbent landscape" on the left shows the areas of the campus which is currently green and open spaces. Because of the building distribution and that whopping great big road that separates the two HP campuses, the new Apple campus will have far greater spaces and greenery, making this campus one of the most beautiful and environmentally friendly in the world. The permeable area of the old campus is 42.6 acres, while the new campus will have 118 acres.