Welcome to the Fab-4 Rehabilitation Projects Toolkit
Are you a San Francisco-Bay Area resident, neighbor, student, employee, commuter, pedestrian, employee, or motorist? Then this information is just for you. This toolkit is a valuable resource to inform and prepare you for CALTRANS’ Fab-4 Rehabilitation projects getting underway soon from 2025-2027. These projects are four separate, major freeway and road rehabilitation projects, designed to significantly increase driver safety and revitalize the freeways and roads you use regularly.
If you’re learning about the Fab-4 rehabilitation for the first time, here’s a breakdown of what’s happening:
- 19th Avenue Repave: Rehabilitation of the entire length of pavement along 19th avenue from Golden Gate Park to SFSU, and upgrade facilities to ADA standards.
- U.S. 101 Bayshore Rehabilitation Project: Improvements to the drainage systems, lane replacement with reinforced concrete paving, and paving of freeway shoulder, ramps, and mainline, and addition of new signage/striping/safety devices.
- I-80 Central Freeway/U.S. 101 Viaduct Project: An overhaul of freeway decks and bridge rails, re-construct joints, and add polyester overlay.
- I-280 Pedestrian Overcrossing and Rehabilitation: Construction of a new pedestrian overcrossing that will connect pedestrians to Cayuga Park, new CMS signage, poly overlay, and paved asphalt concrete and shoulder.
Why is it so important to remain informed and prepared about these projects? One major reason: TRAFFIC IMPACT!
The traffic impact will be significant, causing delays and disruptions to your normal commute routine. Motorists using San Francisco freeways under construction will experience delays and may be required to take detours which will make trips longer. Please plan ahead and consider using public transportation. Some freeways will be entirely closed (during certain nighttime and weekend dates). While closures are underway, SAN FRANCISCO REMAINS OPEN, so please PLAN AHEAD to reach your business, pleasure, and routine destinations on time. Construction on the first of the four projects occurs on 19th Ave., in late summer 2025; next is the U.S. 101 Rehabilitation project in summer 2025; and then the Central Freeway Viaduct project, and finally the I-280 Pedestrian Overcrossing and Rehabilitation. The duration of each of these projects is approximately two years.
Public Events Coming:
In addition to sharing this toolkit, we want to raise awareness of PUBLIC MEETINGS TO BE SCHEDULED SOON. We ask that you consider using this toolkit to encourage your networks to check SFhighwayprojects.com regularly for updates. The toolkit is organized by the type of platforms partner may use to help spread the word including by website, eblast/newsletter, social media, digital calendar, and flyer. We invite you to share this information through your community and organization’s communication channels. Feel free to tailor the messaging in the toolkit, but please maintain the accuracy and intent of the content. If you have any questions about the project or need clarification about the materials, please don’t hesitate to contact us at sfhighwayprojects@dot.ca.gov. For more information, please visit: SFhighwayprojects.com.
To ensure the safety and operability of San Francisco freeways and the safety of the traveling public and work crews, Caltrans is rehabilitating four vital freeway and roads. Read about these important projects.
19th Avenue (SR-1)
Repaving (Scheduled to begin Fall 2025)
Location: SR-1 from Lincoln Way (Golden Gate Park) to Holloway Ave. (SFSU)
SCOPE:
- Full repaving of all lanes—18.8 lane miles including Park Presidio Blvd. & California St. intersection.
IMPACTS:
- Monday through Friday from 9 AM- 3PM traffic delays. No weekend work. Expect traffic delays near Stonestown Mall and SFSU. Residents, students, commuters, and shoppers most impacted.
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For more information please visit the project page.
U.S. 101 Central Freeway / I-80
Viaduct Rehabilitation (Scheduled to begin Fall 2025)
Location: Central U.S. 101 & I-80, near San Francisco-Oakland Bay Bridge
SCOPE:
- Repair and rebuild bridge deck, barrier rails/joints.
IMPACTS:
- Major delays near San Francisco-Oakland Bay Bridge, Central freeway US-101, and I-80. SOMA, Mission, Mission Bay, South Beach, China Basin, Yerba Buena, and Hayes Valley, most impacted. Expect significant noise disturbances and occasional freeway closures.
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For more information please visit the project page.
U.S. 101 Hospital Curve Rehabilitation
(Scheduled to begin Fall 2025)
Location: Between Candlestick Point and the Mission District
SCOPE:
- concrete paving; replace drainage system, ramps, shoulders, new signage, striping.
IMPACTS:
- Major delays, detours, and congestion. Expect significant noise disturbances and occasional freeway closures.
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For more information please visit the project page.
I-280 Farallones Ave Pedestrian
Overcrossing (Scheduled to begin Spring 2027)
Location: Cayuga Park Neighborhood near Daly City
SCOPE:
- Full reconstruction of overcrossing.
IMPACTS:
- Major impacts, detours, and congestion. Expect significant noise disturbances and occasional freeway closures.
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For more information please visit the project page.
FAB4 Frequently Asked Questions
Q1: Why is this work being done?
A: The roads, bridges, drainage structures, and median barriers are in some cases over 70 years old. The Department is addressing potholes and deteriorated elements that have been requested by roadway users. Significant maintenance is required to keep the highway elements operating for the long term, and much of the work will improve the highway user experience. The work is funded by SB 1 (Beall, 2017), also known as the Road Repair and Accountability Act of 2017.
Q2: Why is all the work being done at one time?
A: The projects will be scheduled around each other to best minimize impact to the public. The department is balancing the need for the work with the funding availability.
Q3: How can I stay updated on closures and detours?
A: Caltrans’s www.sfhighwayprojects.com. Also, on the site is access to a Fab 4 Digital Toolkit.
Q1: What areas will be affected by this project?
A: Caltrans is repaving more than 18.8 miles between Lincoln Way and Holloway Avenue. Additionally, the Park Presidio Blvd. and California Street intersection.
Q2: What improvements are being made?
A: This project will rehabilitate the entire length of pavement along 19th avenue from Golden Gate Park to SFSU, and upgrade facilities to ADA standards.
Q3: How long will the project take to complete?
A: The timeline is under final development but is expected to span one year. Schedule details will be released closer to the start date.
Q4: Will access to Golden Gate Park or SFSU be impacted?
A: SFSU will not be impacted when school is in Fall/Spring session. Golden Gate Park at Lincoln Way will experience temporary lane closures may affect access, but detours and signage will be provided to maintain accessibility. There will be no impact to access during the weekend.
For more information please visit the project page.
Q1: What does the project involve?
A: Rehabilitation of both northbound and southbound U.S. 101 lanes, including concrete paving, drainage system upgrades, new center median barrier rail and safety enhancements.
Q2: How long will this project last?
A: The construction is expected to complete in Spring 2028.
Q3: What traffic impacts can be expected?
A: The timeline is under final development but is expected to span one year. Schedule details will be released closer to the start date. Drivers should expect periodic closures, lane reductions, detours, and traffic delays throughout the duration of the project. Construction is expected to begin in October 2025, with a duration of up to two or three years; the exact duration is pending final planning and will be shared publicly when available.
Q4: Will freeway access be completely closed?
A: There will be intermittent closures of ramps during paving. Full freeway closures on four weekends (two each direction) are anticipated to replace the mainline pavement between Cesar Chavez St and the 101/80 interchange. Advance notice will be provided for all major closures.
For more information please visit the project page.
Q1: What is being done to these viaducts?
A: Rehabilitation of both northbound and southbound U.S. 101 lanes, upgrading of the median barriers, adding continuously reinforced concrete pavement, drainage system upgrades, new signage, and safety enhancements.
Q2: How old are these viaducts?
A: The Central and Bayshore Viaducts are approximately 71 years old and require rehabilitation for continued safe use.
Q3: What is the expected duration of this project?
A: The bridge rehabilitation is planned to take two years.
Q4: Will the freeway be closed during repairs?
A: Yes, several weekend closures are expected as well as lane reductions. Work will occur in stages to maintain traffic flow.
For more information please visit the project page.
Q1: Where is the project taking place?
A: In the Cayuga Park neighborhood near Daly City, over I-280 at Farallones Avenue.
Q2: What is the purpose of this project?
A: To rebuild the existing pedestrian overcrossing to be ADA-compliant and expand the walkway from 8 to 10 feet for improved safety and accessibility.
Q3: When will the project start?
A: Construction begins in the summer of 2027.
Q4: How will motorists be impacted?
A: There may be temporary lane closures on I-280 during overcrossing demolition and installation, but advance notice will be provided.
Q5: Will pedestrian access be maintained during construction?
A: The overcrossing will be fully closed during construction, but alternate pedestrian routes will be designated.
For more information please visit the project page.
Project Media Gallery
Additional project resources including downloadable maps, image galleries, and video clips can be found on the media resources page.
Stay Informed & Plan Ahead
For updates, project maps, and detour info:
Visit: www.dot.ca.gov | Caltrans Info Line: 1-800-427-7623