Chris Carlsson presents a historic look at the San Francisco-Oakland Bay Bridge, how it has changed over time, going from two-way traffic on the top deck (3 lanes in each direction) with trains and trucks on the lower deck, to today's new span. The history of automobility surrounding the bridge, and the many other schemes to build more bridges and crisscross San Francisco with high-speed freeways shows the context of the Bridge... The new Bike Pier (not quite halfway-across-the-bay bike lane) gets a close look too.