A tunnel with rainbow arches that connects San Francisco’s Golden Gate Bridge to greater Marin County has officially become the Robin Williams tunnel.

The San Francisco Chronicle reports the new Robin Williams Tunnel signs were installed on Monday night.

The tunnel was unofficially known as the Waldo Tunnel.

The California State Senate last year approved a resolution to change the tunnel’s name to honour the late actor and comedian.

Williams grew up and lived in the Bay Area.

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The two signs – one for each side of the tunnel – cost $US3,000 ($A4,110) that was paid for using private donations.

AAP

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