Southern
Crossing
Length: 13 miles
Planned Routing: Near Army Street/I-280 to near the Oakland Coliseum or current
Grove-Shafter/Cypress/Nimitz Freeway (980/880) interchange
Proposed: 1976
Route Numbering: I-980 (unconfirmed arbitrary designation)
Currently, the Bay Bridge is the only link from San Mateo to San Francisco between the Peninsula and The City and the East Bay. As the burgeoning population only adds to the commute, the Bay Bridge itself can only handle so much traffic between the East Bay and San Francisco.
Although rebuilding the Bridge has been considered, another option that has also been on the backburner for many years is to build a third bridge connecting San Francisco with the rest of the Bay Area. This defeated proposal from 1976, detailed here in a very cheap map I've drawn up, shows the proposed routing for this incarnation of the Southern Crossing:
The other proposed Southern Crossing is a bridge to join I-238 and I-380 together; this passes extremely close to the San Francisco International Aiport, however.
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