California State Route 237
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| Southbay Freeway | ||||
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| Maintained by Caltrans | ||||
| Length: | 11.00 mi (17.70 km) | |||
| Major junctions | ||||
| West end: |
 SR 82 in Mountain View
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 SR 85 in Mountain View US 101 in Sunnyvale I-880 in Milpitas
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| East end: |
 I-680 in Milpitas
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State Route 237 runs from El Camino Real (SR 82) in Mountain View to Interstate 680 in Milpitas. It runs south of the San Francisco Bay, connecting the East Bay to the Peninsula.
This route is part of the California Freeway and Expressway System.
Route 237 begins at a junction of Grant Road 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. 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. It intersects with Highway 101 at the southern corner of Moffett Field. After this intersection, a carpool lane is added, for a total of 3 lanes in either direction. It remains like this as until the east end of the freeway at Interstate 880, where most eastbound traffic is directed to northbound 880. The route becomes a street, Calaveras Boulevard, in Milpitas, terminating at Interstate 680.
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. Exit signs from U.S. 101 north to Route 237 west currently say "Mountain View-Alviso Road". Starting from half a mile after the highway's western terminus, and ending at 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.
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