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Night Lane Closures for High Occupancy Vehicle (HOV) Sign Replacement in Marin, Sonoma Counties on US-101

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Schedule: Marin County work scheduled to start Monday, Feb. 9

US 101 Shield

Marin County and Sonoma County — Crews are scheduled to change high-occupancy vehicle (HOV) signs along Northbound and Southbound US-101 in a 52-mile stretch starting on Monday, Feb. 9. Signs along the corridor in both counties are being modified with signs displaying new uniform carpool hours that were announced in late January.

Signs are in the median of US-101, so the far-left lane in both directions of US-101 are scheduled to be closed. Marin County sign replacement is scheduled to begin on Monday, Feb. 9, and Sonoma County sign replacement is scheduled to start around Wednesday, Feb. 18. Signs will be switched out between 10 p.m. and 6 a.m. in all directions except for Northbound US-101 in Marin County, which will be between 10 p.m. and 7 a.m.

All sign replacement work is weather permitting.

The new HOV lane hours in both counties will be 6 to 9 a.m. in the mornings and 3 to 6:30 p.m. in the evenings, Monday through Friday.

The existing HOV hours of operation on US-101 are 5 to 10 a.m. in the mornings, and 3 to 7 p.m. in the evenings.

During the HOV signage construction, the existing hours will remain in effect. Motorists may see new signage with updated hours, but these hours will not be in effect until all signs are complete around late February.

Cars traveling Southbound on US 101 as work continues as Part of Marin Sonoma Narrows B7 Project in Marin County.

The hours are based on Caltrans traffic analysis along the corridor that was completed in January. Signs will be updated along the entire length of the HOV lanes, stretching from the Richardson Bay Bridge in Marin County and Windsor in Sonoma County.

The new hours will continue to be consistent in Marin and Sonoma counties and will cover a majority of the peak commute hours in both directions in the morning and afternoon/evening. As part of broader transportation management efforts, Caltrans (in partnership with its transportation partners) activated nine ramp meters along northbound and southbound US-101 in Marin and Sonoma counties on Tuesday, Dec. 2. More ramp metering is scheduled to be activated along the corridor as construction activities are completed in the field.

For more information about the current HOV lane hours, see bit.ly/3HoVfOO.

For 24/7 traffic updates, please visit 511.org: https://x.com/511SFBay
For real-time information, visit Caltrans QuickMap: https://quickmap.dot.ca.gov
Follow us on X: https://x.com/CaltransD4
Or call 1-800-472-7623, 1-800-427-ROAD for state highway conditions statewide.