press release:
Between December 12, 2011 and sometime in June of 2012, there will be multiple overnight and some possible weekend closures of the Fauntleroy Expressway at the west end of the West Seattle Bridge, due to a seismic retrofitting project.

During overnight weeknight closures, Route 54 heading to West Seattle will be rerouted via the Delridge exit to S Spokane St below the West Seattle Bridge, and on to Avalon Way, with no stops missed On weekends, Route 55 will also be rerouted with no stops missed.

Buses headed downtown are not affected.