With rare exceptions (mostly help-wanted signs and signs for candidates for local offices before elections) the only outdoor advertising in Marin County, CA, is

With rare exceptions (mostly help-wanted signs and signs for candidates for local offices before elections) the only outdoor advertising in Marin County, CA, is on the buses, the bus shelters -- but only the shelters near highway 101 -- and retail locations advertising stuff sold there. I.e., vastly less outdoor advertising than most of the US.