Interstate 380 (California)

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Interstate 380
Auxiliary route of the Interstate Highway System
Defined by S&HC § 608, maintained by Caltrans
Length: 1.50 mi[1] (2.41 km)
Formed: 1968
West end: I-280 in San Bruno
East end: US 101 in South San Francisco
State highways in California (list - pre-1964)
County routes in California (list)
< SR 371 US 395 >
History - Unconstructed - Deleted - Freeway - Scenic

Interstate 380 (abbreviated I-380) is a short 3.3-mile (5.3 km) spur interstate highway connecting Interstate 280 in San Bruno, California to U.S. Route 101 near the San Francisco International Airport (SFO). The highway primarily consists of only three intersections: I-280, El Camino Real (State Route 82), and U.S. 101. However, I-380 never connects to Interstate 80, its parent interstate.

I-380 is signed as the Quentin L. Kopp Freeway after a prominent State Senator from San Mateo County, California. The road was previously named the Portola Freeway to honor eighteenth century Spanish explorer Gaspar de Portolà, whose 1769-70 expedition discovered San Francisco Bay from Sweeney Ridge (between San Bruno and Pacifica).

This route is part of the California Freeway and Expressway System[2].

Contents

[edit] Route description

Major cities
Bolded cities are officially-designated control cities for signs

I-380 begins at a junction with I-280 in San Bruno. This junction is really only partially built, allowing room to build a proposed freeway extension west towards State Route 1 (see below). I-380 then travels east through the City of San Bruno, intersecting with State Route 82, El Camino Real, before reaching US 101.

At its terminus at US 101, the mainline lanes of I-380 continue as North Access Road. Meanwhile, the ramps to and from southbound US 101 provide connections to the ramps leading directly to San Francisco International Airport, allowing traffic between the Interstate and the airport to avoid merging with the US 101 mainline.

[edit] Future

 This article contains information about a planned or expected future road.
It may contain information of a speculative nature and the content may change as the road's construction or completion approaches and more information becomes available.

There are plans to extend I-380 all the way to State Route 1 (Cabrillo Highway), but due to the route passing over the San Andreas Fault and community opposition, it appears that is is currently an open question to whether that will ever be extended or not. The westbound lanes of I-380 branch off to the right at I-280, leaving a very wide, paved space which would carry the freeway extension under I-280 towards SR 1. This space is currently often used as storage space for equipment used in highway maintenance. A pair of unused bridges crossing over the I-280 South to I-380 East offramp remain as evidence.

Despite the opposition, Chapter 2, Article 3, Section 608 of the California Streets and Highways Code still legally defines Route 380 as traveling from "Route 1 near Pacifica to Route 280 in San Bruno",[1] and the exit numbers assigned at I-280 go to five instead of one or zero.[2]

Although recent California Highway Log still propose alternative plans to extend by more peculiar shape, slightly southwest of the I-280/I-380 interchange might make the extension project slightly longer perhaps making the I-380 a bent V-shape. This project is very controversial, and unlikely to come true.

[edit] Exit list

Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage.

The entire route is in San Mateo County.

Location Postmile
[3][4][5]		 #[6] Destinations Notes
San Bruno T4.70 5 I-280 (Junipero Serra Freeway) – San Jose, San Francisco Westbound exit and eastbound entrance; signed as exits 5A (north) and 5B (south)
5.47 5C SR 82 (El Camino Real) – San Bruno Signed as exit 5 eastbound
6.37 6 US 101 (Bayshore Freeway) – San Francisco, San Francisco International Airport, San Jose Signed as exits 6A (south) and 6B (north) eastbound
South San Francisco 6.76 7 South Airport Boulevard Eastbound exit and westbound entrance
6.76 North Access Road Eastbound exit and westbound entrance

[edit] References

  1. ^ Route Log and Finder List - Interstate System: Table 2. FHWA. Retrieved on 2007-10-04.
  2. ^ CA Codes (shc:250-257)
  3. ^ California Department of Transportation, State Truck Route List (XLS file), accessed February 2008
  4. ^ California Department of Transportation, Log of Bridges on State Highways, July 2007
  5. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
  6. ^ California Department of Transportation, California Numbered Exit Uniform System, I-380 Eastbound and I-380 Westbound, accessed February 2008

[edit] External links

v • d • e
Auxiliary routes of Interstate 80
California: 180 (former) • 280 • 380 • 480 (former) • 580 • 680 • 780 • 880 • 880 (former) • 980 — Nevada: 580 (unsigned) — Wyoming: 180 — Nebraska: 180 • 280 (former) • 480 • 580 (former) • 680 — Iowa: 280 • 380 • 480 • 680 — Illinois: 180 • 280 — Ohio: 280 • 480 • 680 — Pennsylvania: 180 • 180 (former) • 280 (former) • 380 • 480 (former) • 680 (former) — New Jersey: 280 • 680 (former)