Here's an overview of the project from Caltrans:
Caltrans has begun construction on the first of four projects to repave I-80 in Solano County. The first pavement rehabilitation project started on January 2008 from the Tennessee Street overcrossing in Vallejo to American Canyon Road.
The four projects for a total cost of $125 million will eventually rehabilitate 27 miles of pavement on Interstate 80 from Tennessee Street in Vallejo to Leisure Town in Vacaville. The result will be a much smoother, quieter ride for about 150,000 motorists who use this vital roadway every day. These projects will address the pavement conditions, congestion, and will enhance safety and operations.
Pavement rehabilitation and highway improvement work is scheduled to be completed by the end of 2009. Most of the work will be done in the evenings between the hours of 9 p.m. to 5 a.m. Caltrans will be closing one or two lanes and/or ramps in the evenings with detours to frontage roads.
All work will be done within the state right of way and will include: replacing failed pavement areas, providing new asphalt concrete surface, and upgrading the median barrier.