Route Description
It intersects with Highway 101 at the southern corner of Moffett Field. It also has a major intersection with Interstate 880. Westbound traffic can connect to Highway 85 southbound, but the eastbound traffic connection to 85 northbound is labeled as an exit for U.S. 101.
Half a mile from the highway's western terminus, to the I-880 intersection, Route 237 is constructed to Interstate standards, and is named the Southbay Freeway. It is not part of the Interstate system, however, despite a sign on the ramp to it from Northbound I-680 to the contrary. East of I-880 in Milpitas, it becomes a surface street, Calaveras Boulevard, and the highway designation terminates at the intersection with I-680. West of El Camino Real in Mountain View, it becomes a surface street, Grant Road.
It begins at a junction with El Camino Real (CA-82) in Mountain View as a freeway with two lanes in each direction, although most traffic comes from State Route 85. After an intersection with US Route 101, Mathilda Avenue, and Fair Oaks Avenue, a carpool lane is added for a total of 3 lanes in either direction. It remains like this as it passes the companies where commuters work, to its east end of the freeway at I-880, where most eastbound traffic is directed to northbound 880. The route becomes a street, Calaveras Boulevard, in Milpitas, terminating at I-680. Calaveras Blvd becomes Calaveras Road.
Route 237 is known for the many Silicon Valley companies that line its route.
Before Route 237 was upgraded to freeway status in the mid-1990s, it was a 4-6 lane street, known as Alviso-Milpitas Road or Milpitas-Alviso Road depending on different maps showing the description.
The Route 237 corridor has long been sought as a location for a freeway connector between Interstates 680 and 880. Many possible sites have been suggested, from Montague Expressway in North San Jose to Mission Boulevard in Fremont. One map printed before 237's construction to freeway standards between Alviso and 880 showed a new freeway across bay wetlands between Alviso and the Scott Creek Road interchange in South Fremont. Grading and underpasses for a freeway interchange are presently visible along 680 near Scott Creek Road.
Route 237 is known for a number of companies that define Silicon Valley's technological landscape. Many major software and hardware manufacturers have their headquarters along 237. Some of these manufacturers include Lockheed-Martin, Brocade Communications Systems, Nortel Networks, Cisco Systems, Yahoo!, TiVo, Ariba and NetApp.
Route 237 also passes Moffett Federal Airfield, a large former military air base in the Bay Area, and Onizuka Air Force Station, locally known as the blue cube.
Read more about this topic: California State Route 237
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