Update: all lanes are now open. It seems that "a box truck, from a business called 'Diet to Go'...drove directly into the back of the big rig," killing the box truck driver. Very sad. Sigh. According to SFGate, "three lanes of the upper deck of the Bay Bridge are blocked by a fatal accident, the California Highway Patrol says." Did you hear that? How awful. Just terrible. Three whole lanes of traffic have closed......