This image of the San Francisco – Oakland Bay Bridge, taken at sunset, gives an indication of the double-decked structure of the bridge. All the cars visible in the picture are headed in the same direction. Cars heading towards San Francisco are in the box truss section below the upper deck.
The description states:
SAN FRANCISCO-OAKLAND BAY BRIDGE AT SUNSET
The San Francisco-Oakland Bay Bridge is beautifully silhouetted, looking west from Yerba Buena island as the sun sets behind San Francisco, the city by the Golden Gate.
–The style of cars present on the bridge indicate this card dates to the 1950s.