The most heinous of locations is behind a wall on the immediate left entering the Presidio from Arguello St. These are Federal cops and they look for those running the stop sign directly at the gate. Another location is right before the intersection of Presidio Blvd. and Lombard Ave. turning right. These cops wait for motorists either before or after Simonds Loop and/or Sherman Rd., on the curve, just before the stop sign.