Roadwork Alert: Major 19th Avenue and US-101 Projects Impact Wednesday Commutes

Morning Traffic Outlook for San Francisco

San Francisco commuters should prepare for significant delays on major arteries this Wednesday, March 11, 2026. With several long-term rehabilitation projects entering critical phases this spring, travel times are expected to be longer than usual, particularly on the city's west side and near the central freeway corridors.

Major Arterial Roadworks

The 19th Avenue (State Route 1) Paving and Rehabilitation Project remains a primary concern for those traveling between Golden Gate Park and San Francisco State University. Caltrans has transitioned into Phase 2 of the project, which involves full lane repaving from Lincoln Way to Holloway Avenue. Work is scheduled from 7:00 AM to 3:00 PM on weekdays. While at least one lane remains open in each direction, motorists are strongly encouraged to use alternate routes like Sunset Boulevard to avoid heavy congestion during the morning peak.

On the eastern side of the city, the "Fab 4" rehabilitation projects continue to impact US-101 and Interstate 80. Crews are currently working on the US-101 Central Freeway and I-80 Bayshore Viaduct. Drivers should expect intermittent lane and ramp closures near the Hospital Curve. While major weekend-long closures are not scheduled for today, the ongoing bridge deck repairs and joint replacements often lead to unexpected bottlenecking throughout the day.

Local Street Impacts

In the SoMa district, the Transbay Howard Streetscape Project is causing localized delays. Intermittent lane closures are expected on Howard Street between The Embarcadero and 4th Street from 7:00 AM to 4:00 PM. This work includes the installation of new traffic signal infrastructure and protected bicycle lanes. Drivers should exercise caution and watch for detours near the Moscone Center area.

Public Transport and Rail Alerts

• BART: Commuters using the Millbrae and SFO lines should be aware of evening service impacts. Due to the ongoing transition to a new Communications-Based Train Control (CBTC) system, trains will operate at reduced speeds between Millbrae, San Bruno, and SFO starting at 7:30 PM. Additionally, a brief 30-minute service suspension between Millbrae and SFO is expected around 9:00 PM tonight.
• Muni: Service is operating on standard schedules following the start of Daylight Saving Time earlier this week. The 12 Folsom/Pacific route continues to face minor re-routes due to construction on Howard Street.
• Caltrain: No major service disruptions are reported for the morning commute, though riders are reminded that standard maintenance work may cause minor platform changes at the 4th and King Street Station.

Evening Event Advisories

Traffic may increase in the Castro District this evening due to the Sam Smith residency at The Castro Theatre, with doors opening at 7:00 PM. Additionally, a concert at Grace Cathedral (Nintendo in Concert) may lead to localized congestion on Nob Hill during the evening rush. Commuters are advised to plan for extra travel time if passing through these neighborhoods.