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Apple is keen to promote its green ethics and sustainability model. Currently, the campus is split into two by a road, but will be made into one and the road removed. Members of the general public will not be allowed onto the Apple campus, and this new bicycle route is necessary as per council guidelines.
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.