The way US funds public transport sometimes feel really silly to me. It costs $5 to drive across the Bay Bridge. Traffic is a nightmare. But it costs at least $7 for the same trip on the Bart. Bart is still at full capacity showing a clear market for it. A new tunnel would ease the traffic on the bridge and provide better public transport. But, even the so called progressive politicians talk about building a new bridge. Similarly costs are absolutely outrageous - it could cost up to $400 million just to add a bike lane to the Bay bridge.