At Entrance Fee Areas:

(a) Special admission permits for uses, such as group activities, may be issued.

(b) No entrance fee shall be charged for persons under 16 years of age.

(c) No entrance fee shall be charged for travel by private noncommercial vehicle over any road or highway established as part of the National Federal Aid System (defined in 23 U.S.C. 101), which is commonly used by the public as a means of travel between two places which are outside the Entrance Fee Area.

(d) No entrance fee shall be charged for travel by private noncommercial vehicle over any road or highway to any land in which such person has a property interest if such land is within any Entrance Fee Area.

(e) Persons accompanying the holder of a valid single visit permit, Federal Duck Stamp or Golden Eagle, Age, or Access Passport in a single, private, noncommercial vehicle shall be entitled to general entrance.

(f) Where entry is by any means other than single, private, noncommercial vehicle, the spouse, children, or parents accompanying the holder of a valid single visit permit, Federal Duck Stamp or Golden Eagle, Age, or Access Passport shall be entitled to general entrance.