The chip sealing projects will begin on Highway 29 July 6, with the Highway 175 project to begin July 26, Caltrans said. Both projects will continue through August.
Caltrans will chip seal almost 12 miles of pavement on Route 29 from the Lake/Napa County line to the Coyote Creek Bridge, and 8.5 miles of pavement on Route 175 from Cobb to Middletown.
Daytime work hours will be 7 a.m. to 4 p.m., Monday through Thursday, and 7 a.m. to 2 p.m. on Friday on both projects.
On the Highway 29 chip sealing job, nighttime work hours will be 7 p.m. to 6 p.m., Sunday night through Friday morning. One-way traffic control with a pilot car will be in effect.
Motorists should anticipate 15-minute delays in both project areas, Caltrans said.
The agency explained that chip sealing is an economical way to extend the life of existing pavement. It provides a new high-traction surface which typically lasts five to 10 years.
The projects are using a rubberized binder which helps the environment by including ground up rubber from used automobile tires.
The Highway 29 project will use 128 tons of recycled rubber from about 20,000 passenger cars, while 94.5 tons of rubber recycled from 14,500 passenger cars will be used for the Highway 175 stretch, Caltrans said.
Access to and from private driveways and county roads will be available. Caltrans said loose gravel will be present on the road.
Signs reflecting reduced speed limits will be posted, and motorists are urged to use caution when driving through the work zone, watching in particular for pedestrians and bicyclists. Caltrans urged motorists to use alternate routes when possible.
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