The track at this location is following a firebreak, all be it one that hasn't been maintained in many many years
This is a common mode of Cross Country or XC travel here locally as trying to penetrate the dense chaparral is a painful and frustration experience for most.
Most of the currently maintained firebreaks are done with firefighting bulldozers caterpillar model D8 or similar heavy equipment
even so they frequently are very steep at 45° - 70°+ degrees
Less frequently these routes are cleared by hand using inmates
motorcycle=(sometimes yes genearally no)
motorcar= (sometimes yes genearally no) this would be better designated with 4WD=(sometimes yes genearally no)