A little bird could become a big hold up for important upgrades on the Richmond-San Rafael Bridge. A path on the upper deck will enable bike riders to get across in both directions and a third traffic lane on the lower deck will ease congestion for drivers heading eastbound. The backhoes are waiting — the safety barriers are lined to go up — but thanks to a little winged friend, work on a key part of the $70 million Richmond-San Rafael Bridge Bridge re-do has been put on hold. Randy Rentschler, the Metropolitan Transportation Commission said, “In this particular case...