Construction crews have been working steadily to complete the final section of the 17-mile Marin-Sonoma Narrows project to add high-occupancy vehicle (HOV) lanes along US-101 from Novato to Petaluma.
Travelers along northbound US-101, in the construction area, can expect an alignment shift in early 2025 as crews move to finalize the median barrier, final paving and striping in preparation to shift traffic onto the HOV lanes in summer 2025.
When the HOV lanes are open, they will complete a 52-mile HOV system from the Richardson Bay Bridge in southern Marin County to Windsor in Sonoma County.