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Re:Welcoming our first riders in San Francisco by Lammy on Tuesday August 24, 2021 @01:20PM (#28291994)
That's the "Southern Crossing"! https://en.wikipedia.org/wiki/Southern_Crossing_(California)

It would have probably been the continuation of I-980 had that bridge been built: https://en.wikipedia.org/wiki/Interstate_980#History

At one point it was also planned to be just north of SFO. Have you ever taken I-380 east instead of one of the exits to 101N/S? There's a huge multi-lane road that dwindles to basically an airport access road exit.

Re:Welcoming our first riders in San Francisco by pfarrell on Tuesday August 24, 2021 @01:29PM (#28292129)
Oh man, thanks for those links. TIL. A causeway or something that extends off of Alameda? It's wild to think about what that would have done to the area.
Re:Welcoming our first riders in San Francisco by Lammy on Tuesday August 24, 2021 @01:58PM (#28292592)
On the north side there was also a plan to bridge San Francisco / Angel Island / Tiburon! Part of it still exists as Route 131.

https://www.flickr.com/photos/walkingsf/4047626058/

https://www.flickr.com/photos/walkingsf/4047626054/

https://www.cahighways.org/ROUTE131.html

Here you can see an idea of doubling-up the Bay Bridge, plus a view of the Southern Crossing / I-980 alignment: https://www.flickr.com/photos/walkingsf/4247129432/