36 C.F.R. § 1001.10

(a) The signs pictured in 36 CFR 1.10 provide general information and regulatory guidance in the area administered by the Presidio Trust. Certain of the signs designate activities that are either allowed or prohibited. Activities symbolized by a sign bearing a slash mark are prohibited.

(b) The use of other types of signs not herein depicted is not precluded.