The historically congested stretch of Highway 101 south of Petaluma is primed for work that eventually will widen the corridor and provide relief for what is known as the Novato Narrows bottleneck.
But don't get too excited, drivers.
The $120 million project, which really is two projects at once, will take three years and include temporary lane closures that at times will squeeze traffic to one lane in each direction.
And even when construction is done, the carpool lanes won't exist. Funding for them isn't yet available.
Still, at a groundbreaking ceremony Monday in Petaluma, local officials and transportation experts said starting work on the two projects is a huge step forward in the long-term widening of 101 from Windsor to Novato.