S-curve construction Eastern span replacement of the San Francisco–Oakland Bay Bridge

on september 3, 2007, first section associated construction of new east span, 300-foot (91 m) temporary span connecting main cantilever section yerba buena island tunnel, put service. construction of new connector span started in 2007 alongside existing span. caltrans closed bay bridge during labor day weekend crews replace old span. once old section removed, new span rolled place using computer-guided system of hydraulic jacks , rollers. new section secured place , bridge re-opened 11 hours ahead of schedule, morning commute on september 4, 2007. in september 2009, during single holiday closure, new temporary steelwork route traffic around location of final approaches new bridge put in place, , connections tunnel exit , existing bridge completed, done in september 2007. bypass enabled construction of permanent transition structure between double-deck tunnel exit , new side-by-side bridge structure. upon completion of bridge, extended closure allowed removal of temporary structure , completion of road link.

all of sections of old span on yerba buena island (around s-curve routes traffic) dismantled, , supports new span being built in location.

the s-curve site has become known accidents, fender-benders fatal plunge. wrecks typically occurred during non-commute times, when traffic flows faster, @ or above general bridge limit of 50 mph. additional signage , visual , physical indicators indicating 40 mph s-curve speed limit installed following major accident. upper deck speed advisory @ curve posted 35 mph , improved system of rumble strips installed.