Author: Neil Quintanilla

Date: April 3, 2026
Agency: 4 – Oakland
Contact:  Sabrina Martinez
Phone:  (510) 934-5257
Email:  sabrina.martinez@dot.ca.gov

 

Nighttime Lane Closure and On/Off-Ramp Lane Closures on Interstate 80 (I-80) in Vallejo & Fairfield, Solano County

Starting April 6, 2026, from 08:00 PM to 05:00 AM the following day.

 

SOLANO COUNTY  – Caltrans Construction will be starting a new project that requires nighttime lane closure of multiple locations to set up temporary barriers in the construction site to ensure worker and public safety. Closures will occur nightly starting on Monday, April 6, 2026, at 08:00 PM to 05:00 AM the following day until set up completes Friday, April 10, 2026.

This project will install trash capture systems that will stop trash from going out into water sources. It will also entail update of guardrails and construction of mainline pull outs for maintenance vehicles and erosion control.

Schedule:
Nightly: 
Start – Monday, April 6, 2026, at 08:00 PM to 05:00 AM the following day
End- Friday, April 10, 2026

On/Off-Ramp Locations: 
Contractors will set up at one site and once they complete will move to the next location.

Vallejo –

• Eastbound (EB) I-80 On-Ramp from Magazine St.
• Westbound (WB) I-80 Connector On-Ramp from I-780
• I-80/780 West and East Separator
• Georgia St. Overcrossing
• WB I-80 On-Ramp from Solano Ave
• WB I-80 Off-Ramp from Tennessee St.WB I-80 Mainline Near Redwood St. Over Crossing
• WB I-80 On-Ramp from State Route 37
• WB I-80 Off- Ramp to Columbus Pkwy

Fairfield –

• EB I-80 Off-Ramp to Southbound I-680
• State Route 12 / I-80 Seperorator

 

** All work is weather dependent and subject to change**For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBayFor real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/

Date: April 2, 2026
Agency: 4 – Oakland
Contact:  Sabrina Martinez
Phone:  (510) 934-5257
Email:  sabrina.martinez@dot.ca.gov

 

55 Hour Closure of Solano Ave/Spring Road – Interstate 80 (I-80) On-Ramp Vallejo City, Solano County

April 17, 2026, at 07:00 PM to April 20,2026 at 05:00 AM

 

SOLANO COUNTY  –  Caltrans Construction continues to upgrade lighting around Solano County. To ensure worker and public safety, a full closure is scheduled of the Solano Avenue/Spring Road On-Ramp to Westbound (WB) i-80 in Vallejo starting on Friday, April 17, 2026 at 07:00 PM and opening on Monday, April 20, 2026 at 05:00 AM. Caltrans will be constructing curb ramps and installing new traffic signals at the intersection of Solano Avenue/Springs Road and the WB I-80 On-Ramp.

Schedule:
Start – April 17, 2026, at 07:00 PM
End – April 20,2026 at 05:00 A.M

Detours:
Motorists:

Westbound Solano Ave Detour:
Motorists traveling Westbound on Solano Avenue will need to turn right onto Mariposa Street, right turn on Tennessee Street and a right turn onto the WB I-80 on-ramp.

Eastbound Solano Ave Detour:
Motorists traveling Eastbound on Solano Avenue will need to turn left on Mariposa Street, right turn on Tennessee Street and a right turn onto the WB I-80 on-ramp.

Southbound Mariposa Street Detour:
Motorists traveling southbound on Mariposa Street will need to turn right on Solano Avenue, left turn on southbound 14th Street and a left turn onto the Campbell Street WB I-80 on-ramp.

Pedestrians will be detoured to use the opposite side of the road via signage on barricades.

 

** All work is weather dependent and subject to change**

For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay

For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/

Date: 2 April 2026
Agency: Solano Transportation Authority, Caltrans District 4-Bay Area
Contact:  Sean Person, Sabrina Martinez
Phone: (707) 399-3217, Phone: (510) 934-5257

 

State Route 37 (SR 37)/Fairgrounds Drive Interchange in Vallejo: Solano Transportation Authority and Caltrans Begin the Next Phase of Construction

 

SOLANO COUNTY  – The Solano Transportation Authority (STA), in close coordination with its transportation partner, the California Department of Transportation (Caltrans), is continuing construction work on the new State Route 37 (SR 37)/Fairgrounds Drive Interchange Project in Vallejo. The interchange improvement project will enhance motorist safety and improve bicycle and pedestrian access with construction of a new Diverging Diamond Interchange. This is the first-ever Diverging Diamond Interchange (DDI) constructed in the Bay Area and only the second-ever constructed on a major highway in California.

Coming Soon!
Thank you for your continued cooperation during construction of the new State Route 37/Fairgrounds Interchange. Construction is nearing completion and the new Diverging Diamond Interchange is expected to open to traffic in the early summer, weather permitting.

The Diverging Diamond Interchange will provide a safer, easier entrance to Vallejo while improving accessibility for residents and businesses near the SR 37 and Fairgrounds Drive corridor. The new interchange will improve traffic flow in the area, increasing connectivity to regional transit, the greater Vallejo area, and employment and recreation centers, including Six Flags/Discovery Kingdom. The project will allow bicyclists and pedestrians a more direct bike path to Vallejo from surrounding communities, such as American Canyon and Napa, and low-cost transportation options to local attractions.

Please visit the STA website for more information. Navigating the Diverging Diamond is easy! Just follow the road! Please watch the informational video available on the STA website for more information.

 

What to Expect Prior to the Opening of the new Diverging Diamond Interchange:
In early April, traffic on Fairgrounds Drive will be shifted in the northbound and southbound directions under SR 37 to allow for the new median to be constructed.

The following construction impacts may be expected in early April 2026:

• Motorists on Fairgrounds Drive at SR 37 should watch for temporary traffic lane shifts and follow all on-site signage. The eastbound off-ramp at SR 37/Fairgrounds Drive will be closed overnight with detours. Closures are scheduled from 10:00 PM until 6:00 AM.
• The westbound on-ramp from Fairgrounds Drive to SR 37 will be closed overnight with detours. Closures are scheduled from 8:00 PM until 6:00 AM.

Motorists should drive with caution in construction zones and expect travel delays. All work is weather dependent.

We appreciate the community’s and motorists’ cooperation and patience as important work to improve the safety and accessibility of this important project continues!

To learn about how to use the DDI, please watch our informational YouTube video at https://youtu.be/L7QOoovsVuU?si=AOsSTF2hREcpQwhA.

For general questions, please email our project team at: SR37-FairgroundsPIO@portal3.pbid.com.

For more information about the project and to view a video explaining the DDI design, please visit https://sta.ca.gov/project/redwood-parkway-fairgrounds-dr-improvementproject/.

Date: March 24, 2026
Agency: 4 – Oakland
Contact:  DeNise Harding
Phone:  (279) 234-2175

UPDATE: FINAL NIGHT OF CARQUINEZ BRIDGE (I-80) STEEL WELD INSPECTION & PLATE REPAIRS

 

CONTRA COSTA & SOLANO COUNTIES  – Caltrans has performed essential T1 Steel Weld Inspection Projects for weld inspections and repairs on three Bay Area Bridges, San Mateo-Hayward Bridge (SR-92), Benicia-Martinez Bridge (I-680) and Carquinez Bridge (I-80). This project began in Fall of 2023 and was critical to ensure the long-term safety and integrity of these important Bridges.

The final scheduled night for Steel Weld Inspection and plate repairs on the Carquinez Bridge eastbound I-80 in Crockett is Wednesday March 25, 2026; at 3:00 AM and will conclude at 1:00 PM.

The inspections of the San Mateo-Hayward Bridge (SR-92) and Benicia-Martinez Bridge (I-680)have been completed. Upon completion of this project, all three bridges will continue tomeet established safety requirements, ensuring that drivers and commuters can rely on thesevital crossings for safe travel throughout the region.

Carquinez Bridge eastbound I-80 Lane/Ramp Closure Details for Wednesday, March 25th 3:00 AM to 1:00 PM

1. Full Closure: EB I-80 Onramp fromPomona St/San Pablo Ave
2. Lane Closures: EB I-80 Lanes 3 and 4from Refinery Rd to Carquinez Toll Plaza

Drivers may experience minor delays and are advised to plan ahead and allow extra time. Be work zone alert, drive with caution through the work zone.

For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay

For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/

Date: March 23, 2026
Agency: 4 – Oakland
Contact:  Sabrina Martinez
Phone:  (510) 934-5257
Email:  sabrina.martinez@dot.ca.gov

 

Nighttime Traffic Control on State Route-12 in Suisun City, Solano County

Eastbound and Westbound direction from Walters Road to Lambie Road until completion of the project.

 

SOLANO COUNTY  –  Caltrans Construction continues rehabilitation work on State Route – 12, by installing median concrete barriers and guardrails.

Eastbound and westbound lanes of State Route12 will be subject to one-way traffic control. With one lane open at a time alternating directions of traffic through the work zone.

Schedule:
Monday – Thursday from 08:00 PM to 05:00 AM
Friday from 09:00 PM to 07:00 AM

Weekend closures as needed
Saturday from 09:00 PM to 08:00 AM
Sunday from 09:00 PM to 05:00 AM

** All work is weather dependent and subject to change**

Date: March 23, 2026
Agency: 4 – Oakland
Contact:  Sabrina Martinez
Phone:  (510) 934-5257
Email:  sabrina.martinez@dot.ca.gov

 

Daytime Intermittent Lane Closure on State Route 12 Drouin Drive to State Route-113

Monday March 23 through Saturday March 28

 

SOLANO COUNTY  – Caltrans Maintenance crews will be out on State Route12 replacing channelizers. Work will be completed in sections, starting from Drouin Drive to Church then Church Road to Summerset Road until they reach State Route 113.

Traffic will be stopped in both directions for 10 to 15 minute increments, channelizer will be replaced, then traffic will be allowed through until it clears for another 10 to 15 minute increment and repeating the process.

Schedule:
Monday March 23 through Saturday March 28 from 0600 A.M to 04:00 P.M.

The public is advised to use an alternate route, if possible, to avoid delays.

** All work is weather dependent and subject to change**

Date: March 2, 2026
Agency: 4 – Oakland
Contact:  Sabrina Martinez
Phone:  (510) 934-5257
Email:  sabrina.martinez@dot.ca.gov

Daytime Single Lane Closures on State Route 29 (SR-29) from Curtola Parkway to Valle Vista Avenue for Pavement Project in Vallejo

Schedule: Through March – Monday through Friday from 9 a.m. to 4 p.m.

SOLANO COUNTY  – Caltrans Construction is continuing its pavement rehabilitation and Complete Streets project on State Route 29 (SR-29), also known as Sonoma Boulevard. In addition to driveway and alley repaving at multiple locations. Lighting fixtures, like lamp poles will be installed in multiple areas as well. All work is taking place on SR-29 from Curtola Boulevard to Valle Vista Avenue in Vallejo.

Work will continue in March and run through early April from 9 a.m. to 4 p.m. Mondays through Fridays on both Southbound and Northbound sides of SR-29. There will be intermittent single-lane closures (depending on where the work occurs). One city street will remain open in the direction of travel during the day.

**All work is dependent on weather. Work will generate noise from equipment used to complete the repaving.**

For more information, see this site: https://dot.ca.gov/caltrans-near-me/district-4/d4-projects/d4-sr29-vallejo

For 24/7 traffic updates, follow 511.org: https://twitter.com/511SFBay

For real-time traffic, click on Caltrans QuickMap: http://quickmap.dot.ca.gov/

Date: February 27, 2026
Agency: 4 – Oakland
Contact:  Sabrina Martinez
Phone:  (510) 934-5257
Email:  sabrina.martinez@dot.ca.gov

 

UPDATE:
Daytime Single Lane Closure on State Route -29, Interstate-80 and Interstate-780

Schedule: Monday – Friday from 9 AM to 3 PM

 

SOLANO COUNTY  – Caltrans is continuing to work with installation of new electrical equipment to improve pedestrian safety at unsignalized crosswalks around Solano County. This includes new ADA curb ramps and restriping of the cross walks around the intersection.

New ADA Compliant curb ramp will continue to be constructed in the following locations through Friday, March 20 a single lane will be closed with one city street open in the direction of travel during the day from 9 am to 3 pm.

Pedestrians are directed to utilize the crosswalk on the other side of the road via signage barricades on the sidewalk.

** All work is weather dependent and subject to change**

Detour Information:

Vallejo
• SR-29 – at Ryder Street and at Arkansas Street.

• SR-37 – at Eastbound off-ramp to Wilson Avenue

• I-80 – Westbound on-ramp from Springs Road/Solano Avenue (SR-29)
Ramp Detour
Drivers trying to get on WB I-80 from Springs Road/Solano Avenue should take Mariposa Street toward Tennessee Street; take a right on Tennessee Street and then take the on-ramp to Westbound I-80.

• I-80 – WB On/Off-Ramp from/to Tennessee Rd.
Ramp Detour
Drivers trying to get onto WB I-80 on-ramp from Eastbound Tennessee Street: take a right on Mariposa Street; continue on Mariposa Street and take the on-ramp to Westbound I-80

• I-780 – Eastbound off-ramp to Glen Cove Road
Ramp Detour
Motorist trying to get on I-780 from Glen Cove Road need to continue on Glen Cove Parkway toward Benicia Road and take a right on Benicia Road; then a right on Columbus Parkway; take a right on Rose Drive/State Park Road and onto the on-ramp to Eastbound I-780

Fairfield
• I-80 – Westbound and Eastbound on- and off-ramp from Allison Drive

Benicia
• I-780 – Westbound and Eastbound on-ramp from East Fifth Street
Ramp Detour
Drivers trying to access the on-ramp for I-780 from East Fifth Street need to take a right on Military West; then a right on East 2nd Street. Then take the on-ramp to Westbound I-780