Interstate 780
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Interstate 780 is a 6.5 mile-long Interstate spur route in northern California connecting Interstate 80 in Vallejo with Interstate 680 at the approach to the Benicia-Martinez Bridge in Benicia. Both cities are in the far northeast part of the San Francisco Bay Area.
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The highway was once part of I-680 (CA), but when that was re-routed in the 1970s, the remnant was designated as I-780.