A realigned, 2.5-mile segment of Highway 101 north of San Francisco opened this month, a major step in widening 16 miles of the heavily traveled Marin-Sonoma Narrows. The larger $743-million project is designed to clear chronic bottlenecks and elevate the roadway from the flood-prone wetlands.
To deliver the project, the Marin and Sonoma transportation authorities, along with Caltrans, divided the job into 18 different contracts, says Marin project manager Nick Nguyen. Four key contracts remain to finish the project by adding carpool lanes to two more segments.