They are all over in Briones, Quite the surprise when I am huffing up some steep incline on the gravel bike watching my HR going through the roof, and I hear a couple riders approaching from the rear talking in normal voices. Turn around only to see two guys on downhill/enduro e-bikes cruising up the hill w/full protective gear and full face helmets slung over their bars. A number of supporters will say it gets people on bikes that wouldn't be out there otherwise, I get that but I am seeing more new riders way into the interior of parks that likely wouldn't have the fitness to get out there w/o assistance and don't possess all the needed bike handling skills.