36 CFR 1004.10: Travel on Presidio Trust roads and designated routes.

(a) Operating a motor vehicle is prohibited except on Presidio Trust roads and in parking areas.

(b) The following are prohibited:

(1) Operating a motor vehicle not equipped with pneumatic tires, except that a track-laying motor vehicle or a motor vehicle equipped with a similar traction device may be operated on a route designated for these vehicles by the Board.

(2) Operating a motor vehicle in a manner that causes unreasonable damage to the surface of a Presidio Trust road or route.