Started on the east side of otay mountain, on Marron valley right turn, go for several miles until Gun Range, keep going down, and u will see the trail keeps going, then you will see on your right hand side a little xing with OTAY MOUNTAIN TRUCK TRAIL written on it. Cell phone signal is very bad in this area, i recommend a stand alone bluetooth gps unit if u want to log your trip. I was glad didnt bump with anyone, no border patrol nothing. The uphill road is pretty long, so be patient, it just keeps going up. The road is from man filled gravel, it can be slippery because its just gravel when dry. Best traction when wet. Once you get to the very west exit gate, its locked. You will see a fire road going to the right side, take it and there is a tricky exit, u better have 4wd for this exit, as its steep, short and off camber. I was lucky my avalanche is modified with long travel suspension, and 35 inch tires, otherwise i doubt a normal avalanche can get out through there, its an exit for jeeps really, short wheelbase and narrower. That was really the only hard part, getting out.