Interstate 380

Interstate 380

Interstate 380 is the Quentin L. Kopp (formerly Gaspar de Portola) Freeway, a short connector between Interstate 280 (Father Junipero Serra Freeway) in San Bruno and U.S. 101 (Bayshore Freeway). The east end provides direct connections with San Francisco International Airport (SFO).

A long term proposal for the California State Route 380 freeway outlined an extension of the route west from I-280 to SR 1 near Pacifica. Obstacles against this controversial highway included lengthy environmental review, community opposition, earthquake considerations due to the route passing over the San Andreas Fault and others. Exit numbers for I-380 start at 5, factoring in the unbuilt extension west to SR 1.

I-380 was established as an Interstate highway in December 1968 per the Federal Highway Act of that year. Subsequent actions by the state modified the Streets and Highways Code in 1969 with former SR 186 redesignated as Interstate 380.1

Southern Crossing

The east end of I-380 was suggested by some as a potential western terminus of a new trans-San Francisco Bay bridge. Proposals for an additional crossing, including the Southern Crossing at Hunters Point in San Francisco, arose between the 1940s and 1970s.2

Pushed by Senator Dianne Feinstein, D-California initially in 2000, ideas for a Southern Crossing continued over the ensuing two decades. A two-year study released on April 3, 2002 concluded that building a new span from I-380 on the Peninsula east to Interstate 238 in San Leandro would cost $8.2 billion.3 A subsequent study in 2012 estimated that a bridge carrying both vehicles and transit would cost $12.4 billion. Feinstein and Representative Mark DeSaulnier, D-Concord advocated a new crossing, referencing increased congestion on the San Francisco-Bay Bridge (I-80) and intolerable traffic demands on streets and mass transit, in a letter issued to the Metropolitan Transportation Commission (MTC) on December 6, 2017.2 The MTC did not commit to a new bay-crossing study at the time, citing that it was not on the list of projects approved by Regional Measure 3, a funding ballot that eventually passed on June 5, 2018. Paid for by a $3 toll increase on seven state-owned bridges, Regional Measure 3 will raise an estimated $4.45 billion over a ten year period for capitol projects. The bulk of money will fund transit projects, with 34.4 percent going toward highway improvements or other road projects.4

References:

  1. California Highways: Route 380 by Daniel Faigin
  2. "Feinstein: Traffic is terrible. Build a new bay bridge." San Francisco Gate (CA), December 6, 2017.
  3. "New bridge? Yeah, right / Southern Crossing, transbay tube would cost at least $8 billion, study says." San Francisco Chronicle (CA), April 3, 2002.
  4. "Bay Area voters OK higher bridge tolls to curb traffic." The Mercury News (San Jose, CA), June 5, 2018.
  5. Newton-John, Mark.

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Page Updated Friday July 14, 2023.