text: Just to update this since it has been a year, as far as the access goes it looks footways and bicycle routes have been fixed, The few roads that have private access are that way because they are considered by the campus as part of the university core and can be accessed by special vehicles when approved. As far as things like pedestrians and bikes go, those are up to discretion of the campus as to when and how much they can use it. Therefore, I think private access is appropriate where it is currently used. The case could actually be made that there could/should be access restrictions on a lot of the paths because they are semi restricted to students or other permitted people only, not to mention there is strict lock down times. but I don't think it is worth the time to figure out how and map it that way.  For a reference on the car restrictions here is the website http://taps.ucdavis.edu/parking/information/core