16. The P-40 sign announcing a prohibited direction indicates the prohibition to take a trail.This sign may be accompanied by the P-40-P tab sign that prohibits access to the trail or by the P-110-P-2 tab sign which indicates that authorized vehicles are permitted.
Authorized vehicles within the meaning of the P-110-P-2 tab sign are those that provide emergency services, either for highway and public safety, or for the maintenance, repair or building of the trail system.