Overview
- Caltrans opened continuous carpool lanes between Sausalito and Windsor on Monday, linking roughly 50–52 miles of HOV corridor.
- The $762 million Marin–Sonoma Narrows project added a third lane in each direction over 16 miles between Novato and Petaluma after 14 years of phased work.
- To align with regional policy, weekday HOV hours were extended on Sept. 8 to 5–10 a.m. and 3–7 p.m. in both counties.
- Drivers and local officials report longer queues and risky lane changes, a petition opposing the hours neared 5,000 signatures, and TAM previously warned of congestion in San Rafael and Corte Madera.
- Caltrans is monitoring traffic before considering any change, night construction and intermittent closures continue into the fall, and the end of clean‑air vehicle HOV decals on Oct. 1 could further affect lane use.