I-680  is a heavily traveled route that is being expanded and widened in several locations. The section of freeway through San Jose and Milpitas is generally eight lanes, but it is only four to six lanes wide through rural Sunol.  This section is being widened to accommodate commuters between the jobs in Silicon Valley and affordable housing in the Central Valley. The former cloverleaf at the junction of Interstates 580 and 680 is in the midst of a reconstruction, and the freeway between Pleasanton and Concord has recently been expanded. Interstate 680 ends at its junction with Interstate 80 near Fairfield. Along it, route I-680 interchanges with I-580 near Dublin and I-780 at Benicia.

The portion of I-680 from Alamo to Sunol is very close to the Calaveras Fault and structures along and over the freeway may sustain significant damage in the event of a major earthquake on the Calaveras Fault.

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