In the innercity of Amsterdam the old houses are built close together with narrow alleys between them. In this alley in the Red Light District a gate has been placed that can be closed in the evening and during the night. Many noisy (drunken) people are walking around there and keep the people who live there from their sleep. So the sign says:
"No acces for pedestrians between 18.00-8.00 am, except people who live here"
Also bicycles and mopeds are forbidden, the three crosses belong to the coat of arms of Amsterdam but I don't know why it is red circled.
Linking to "Signs, signs"