Interstate 380 is a busy connector linking I-280 at San Bruno with U.S. 101 (Bayshore Freeway) at South San Francisco and San Francisco International Airport (SFO). I-380 constitutes a six lane freeway with auxiliary lanes added between entrance and exit ramps.
Ramps at San Francisco International Airport (SFO) were upgraded in the early 2000s as part of an expansion project that included a new terminal. An extension of the Bay Area Rapid Transit (BART) system, which commingles with the I-380 ramps, enhanced access to the airport.
I-380 was established by the December 1968 Federal Aid Highway Act. It was constructed by the early 1970s to replace then-California 186. Designated the Portola Freeway, it was also named the Quentin Kopp Freeway in the 1990s.
Plans previously called for extending Interstate 380 west from I-280 to California 1 at Pacifica. Heavily disputed due to environmental, terrain, and traffic impact issues, the roadway remains unbuilt. Provisions were however made at the interchange joining I-280 and I-380 and exit numbers start at five, referencing the unconstructed alignment from Pacifica.
Throughout the latter half of the 20th century, studies also called for additional crossings of San Francisco Bay. One of the corridors considered was a bridge system linking Interstate 380 on the San Francisco Peninsula with Interstate 238 at the East Bay. The crossing was envisioned to span the bay near its widest point. Several obstacles, including funding and mitigating for environmental concerns, prevented the proposed route from moving forward. The I-380 proposal was separate from the “Southern Crossing”, a cross bay route considered from San Francisco to Alameda.