Operating hours: Mondays through Fridays from 2 p.m. to 7 p.m.
Marin County — Caltrans, in partnership with the Transportation Authority of Marin, is scheduled to activate four ramp meters along Northbound US-101 in Marin County on Tuesday, June 24.
These four ramps will be activated:
- Bridgeway/Gate 6 Road diagonal on-ramp
- Eastbound Tiburon Boulevard/SR-131 loop on-ramp
- Westbound Tiburon Boulevard/SR-131 diagonal on-ramp
- Westbound Tamalpais Drive diagonal on-ramp
These ramp meters are located in the cities of Sausalito, Mill Valley and Corte Madera where traffic bottlenecks have been identified. Metering signals will be active Mondays through Fridays from 2 p.m. until 7 p.m. each day.
The ramp metering operations will help reduce traffic congestion and delays, enhance safety and improve the efficiency and reliability of commuter traffic along the corridor.
This activation marks the first phase of the broader ramp metering initiative planned for US-101 in Marin County. As funding becomes available, additional ramp meters are expected to be implemented on both the northbound and southbound directions.
For Caltrans’ ramp-metering activation hotline, call (510) 286-4531.
What to expect
During ramp metering hours at the specific on-ramps, motorists will encounter active ramp metering signals that cycle to manage vehicle flow. Advance warning signs at these metered on-ramps will also be activated simultaneously to alert drivers.
What Is ramp metering?
Ramp metering is a proven traffic management strategy that uses traffic signals on freeway on-ramps to control the rate at which vehicles enter the freeway. By creating room between vehicles, ramp meters reduce congestion, enhance safety, and improve overall traffic flow.
New HOV lane hours
Upon completion of the Marin Sonoma Narrows project in late summer 2025, there will be 52 miles of continuous HOV lanes on US-101 between the Richardson Bay Bridge in Marin County and Windsor in Sonoma County. There will only be one HOV in each direction of US-101.
Currently the HOV lanes in Marin and Sonoma counties operate at different times. Now that the gap in the HOV lanes through the Marin Sonoma Narrows will be closed, the hours of operation will be revised to ensure consistency.
The new hours will be 5 a.m. to 10 a.m. in the mornings and 3 p.m. to 7 p.m. in the evenings, Monday through Friday. Signs along the existing HOV lanes in Marin and Sonoma counties will be modified or replaced with signs displaying the new hours.
For more on the new 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.
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