FATMAP difficulty grade
Toll Road is a wide, loose, steep fire road in the classic vein of Mammoth Mountain volcanic pumice riding.
It forms a connection from Skid Marks to Bridge the Gap.
While Mammoth Mountain gives this route a double black diamond rating in their trail map, this rating is really only for steepness.
This trail, while loose, is relatively non-technical, so we’ve downgraded the FATMAP rating to merely “severe." Sources: https://www.youtube.com/watch?v=ATCU5nyh_fI