Caltrans broke ground Monday on the first of a series of planned projects intended to reduce congestion and improve safety for more than 150,000 motorists who travel through the Interstate 80/Interstate 680/State Route 12 interchange in Solano County daily.

During the first phase of a seven-phase project, a new Green Valley Road overcrossing will be constructed above I-80 about 200 feet east of the existing overcrossing. The new overcrossing will have twice the number of lanes (four) as the existing overcrossing, along with a new on-ramp to westbound I-80/SR-12. The connector ramp from westbound I-80 to SR-12 also will be widened from one lane to two lanes.

This first round of improvements will cost about $65 million and could be completed by summer 2016. The project received $15 million from Proposition 1B, a 2006 voter-approved transportation bond. To date, more than $17 billion in Proposition 1B funds have been used statewide for transportation purposes.

The remaining six phases will be constructed and completed as funding becomes available. Improvements in the upcoming phases will include:

New interchange at Red Top Road and I-680

New westbound connector ramp from westbound I-80 to southbound I-680

Realignment of I-680 between I-80 and the Lopes Road exit in Cordelia

Realignment of the connector ramp from SR-12 to eastbound I-80

New entrance/exit ramps

The extension of some local streets leading to I-80 and SR-12

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“Collectively, these improvements will ease congestion, reduce cut-through traffic on local streets, and enhance safety by streamlining connections for motorists transitioning between the three major state routes linking the Bay Area, Sacramento, and the Napa Valley,” said Caltrans District 4 Director Bijan Sartipi.

The upgrades at the I-80/680/SR-12 interchange are part of an ongoing effort to improve the transportation infrastructure in Solano, Sonoma and Napa counties.

Last July, a new $100 million truck complex opened along Interstate 80 near Fairfield. The state-of-the-art facility fast-tracks inspections for more than 2 million trucks annually that travel from the Port of Oakland on I-80 through Northern California. Several miles of SR-12 in Napa County also were widened last year to ease traffic backups, and additional miles of the highway are now being expanded in Sonoma County.

For more information on the I-80/680/SR-12 project, visit


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