Folder: S.F. Bridges-Bay-Approaches, Ramps.
On back: "Aerial view of the East Bay distribution structure for the Oakland-San Francisco bridge showing near bottom left, the final link to be opened to traffic following a civic ceremony at 11:00 a. m., Monday, October 24, 1955. The two-lane structure at extreme left is a detour trestle that will be dismantled after new ramp is opened. Near the top of the picture, the dark area to the right of the Toll Plaza is the location where work is underway for construction of new lanes through the Toll Plaza for westbound Bay Bridge traffic.".