One-way traffic lanes have been designed to aid in the prevention of 
collisions at the approaches to San Francisco Bay but are not intended 
in any way to supersede or alter the applicable Rules of the Road. 
Separation Zones are intended to separate inbound and outbound traffic 
and to be free of ship traffic. Separation Zones should not be used except 
for crossing purposes. Mariners are requested to stay outside  the circular 
separation zone centered on the San Francisco Approach Lighted Horn Buoy SF. 
When crossing traffic lanes and separation zones use caution.