Interstate 680, North-south highway in Santa Clara and Alameda Counties, United States
Interstate 680 is a north-south highway that runs through multiple counties in Northern California. The route passes through valleys and mountain passes, connecting San Jose with numerous communities across the East Bay region.
The highway began as State Route 21 in 1933 and received Interstate status in 1955. This designation marked a major shift in Northern California's transportation infrastructure.
The road connects technology hubs with residential areas and shapes daily life as a central transportation artery for the region. It enables commuters and visitors to move between economic centers and communities spanning multiple counties.
The road features multiple exits connecting to other major highways including Interstate 880, California 237, and US Route 101. Travelers should note the terrain includes mountain passages and congestion can occur during peak hours.
A large American flag mural appeared on the Sunol Grade concrete hillside after September 11, 2001, and remained visible to drivers until 2010. This temporary artwork became a notable landmark for millions of regional commuters.
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