Interstate 280 in California
| I-280 | |||
| Get started | San Jose | ||
| End | San Francisco | ||
| Length | 57 mi | ||
| Length | 92 km | ||
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Interstate 280 or I -280 is an Interstate Highway in the U.S. state of California. The highway forms a north-south connection across the San Francisco Peninsula, the peninsula that separates San Francisco Bay from the Pacific Ocean. I-280 connects San Jose and San Francisco, part of the San Francisco Bay Area. The route is one of two north-south highways across the peninsula, the other being US 101, which runs parallel to I-280. US 101 cuts through the suburbs, I-280 runs along the west side. The highway is called by some “the most beautiful highway in the world”. While that claim is easily disputed, I-280 runs through the hilly landscape of the peninsula. The highway is also called Junipero Serra Freeway, and is 92 kilometers long.
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Travel directions
The interchange between I-280 and SR-87 in San Jose.
I-280 near Stanford.
The highway begins at a major interchange with I-680 and US 101, on the east side of San Jose. The city of San Jose is the largest in the San Francisco Bay metropolitan area, with a population of 930,000, significantly more than the better-known city of San Francisco, to which the highway runs. San Jose is the tenth largest city in the United States. The highway has 2×4 lanes here, and it passes right by the center of San Jose. Here one intersects with SR-87, the Guadalupe Parkway, which forms a short north-south highway within San Jose. After this there are 4+5 lanes. On the west side of San Jose, one crosses I-880, the Nimitz Freeway, which runs north to Oakland. SR-17, the Santa Cruz Highway, runs south to the coastal city of Santa Cruz. After this, 2×4 lanes will be available again. This leads to the suburb of Santa Clara, which has a population of 103,000 and is one of the larger suburbs of San Jose. Then you pass Sunnyvale, which has a population of 132,000, and is located in the so-called “Silicon Valley”, a large technology industrial estate, which incidentally is not located directly along the I-280, but is situated more to the north.
At Cupertino you cross the SR-85, which forms more or less a ring around San Jose. This is where the real suburban highway route begins. On the San Francisco Peninsula, the suburbs stretch north-south across the eastern side of the peninsula. Because the peninsula is mountainous and densely forested, it is one long row of suburbs, no wider than about 8 kilometers, but extending for 60 kilometers. One comes through the expensive neighborhoods of Los Altos. Many of the suburbs that are emerging now don’t exceed 30,000 inhabitants, but all together they put a lot of pressure on US 101 and I-280. One passes by Stanford, home to the famous Stanford University.
From Redwood City, I-280 cuts through the San Andreas fault line, with a number of lakes formed here, I-280 is a scenic route. At San Mateo, SR-92 crosses the J. Arthur Younger Freeway, which leads to the San Mateo-Hayward Bridge, which crosses San Francisco Bay. Only at San Bruno do you turn back into the suburbs. Here one crosses I-380, one of the shortest highways in California, which runs for only 2 kilometers to US 101. It crosses the suburbs of South San Francisco and Daly City, and joins SR-1, or Cabrillo Highway, in Pacifica. The SR-1 is also called Pacific Coast Highway. From here, 2×6 lanes are available.
It crosses the border with San Francisco, the second largest city in the metropolitan area with 744,000 inhabitants. Here the name changes to John F. Foran Freeway, and the road narrows to 2×4 lanes. It traverses southern San Francisco, and then crosses US 101 at the Alemany Maze Interchange. This junction is complicated, with a number of exits to the underlying street network incorporated. Here, US 101 continues into downtown San Francisco, and Interstate 80 continues toward Oakland and Sacramento. The I-280 then becomes a double-deck highway, passing through a large industrial estate. The highway eventually ends at King Street and 6th Street, just south of downtown San Francisco.
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History
Interstate 280 is built over the San Andreas Fault, an active fault line. The highway was built mainly in the 1960s, the portion in San Jose opened to traffic in 1964. For a long time there was a missing link between Woodside and State Route 92, near Redwood City. This link was not completed until 1973. The highway was originally planned to connect directly to I-80 at the San Francisco-Oakland Bay Bridge, and has been largely constructed, but construction was later halted, just missing I-80. You now have to take the busy US 101.
Opening history
| From | Unpleasant | Length | Date |
| 52 San Francisco-San Jose Avenue | 54 | 3 km | 00-00-1963 |
| 54 | 56 San Francisco-18th Street | 3 km | 00-00-1964 |
| 50 San Francisco-Alemany Avenue | 52 San Francisco-San Jose Avenue | 3 km | 00-00-1964 |
| 5 | 7 Santa Clara – Saratoga Avenue | 3 km | 00-00-1964 |
| 7 Santa Clara – Saratoga Avenue | 12 | 8 km | 00-00-1965 |
| 48 Daly City-San Pedro Road | 50 San Francisco-Alemany Avenue | 3 km | 00-00-1965 |
| 12 | 20 Palo Alto-Page Mill Road | 13 km | 00-00-1967 |
| 34 Highlands-Bunker Hill Drive | 42 San Bruno-Crystal Springs Avenue | 13 km | 00-00-1967 |
| 44 South San Francisco-Avalon Drive | 48 Daly City-San Pedro Road | 5 km | 00-00-1967 |
| 56 San Francisco-18th Street | 58 San Francisco King Street | 3 km | 00-00-1968 |
| 20 Palo Alto-Page Mill Road | 27 Woodside Farm Hill Boulevard | 12 km | 00-00-1969 |
| 3B San Jose Bird Avenue | 4 San Jose-Southwest Expressway | 2 km | 00-00-1969 |
| 33 | 34 Highlands-Bunker Hill Drive | 2 km | 00-00-1969 |
| 42 San Bruno-Crysal Springs Avenue | 44 South San Francisco-Avalon Drive | 3 km | 00-00-1971 |
| 4 San Jose-Southwest Expressway | 5 | 2 km | 00-00-1972 |
| 0 | 3B San Jose Bird Avenue | 5 km | 00-00-1972 |
| 27 Woodside Farm Hill Boulevard | 33 | 10 km | 00-00-1973 |
Traffic intensities
| Exit | Location | 2007 | 2016 |
| Exit 1 | San Jose ( I-680 ) | 161,000 | 256,000 |
| Exit 3 | San Jose ( SR-87 ) | 232,000 | 241,000 |
| Exit 5 | San Jose ( I-880 ) | 205,000 | 220,000 |
| exit 12 | Cupertino ( SR-85 ) | 137,000 | 149,000 |
| Exit 24 | Menlo Park | 95,000 | 110,000 |
| exit 33 | San Mateo ( SR-92 ) | 104,000 | 113,000 |
| exit 43 | San Bruno ( I-380 ) | 167,000 | 204,000 |
| exit 47 | Daly City | 212,000 | 216,000 |
| Exit 54 | San Francisco ( U.S. 101 ) | 164,000 | 174,000 |
| exit 57 | San Francisco | 48,000 | 61,000 |
