Caltrans District 4

Caltrans District 4 - Working to bring you safe, efficient, accessible, and environmentally responsible highways and bridges in the Bay Area.

[Caltrans District 4 @CaltransD4]

🚨Coming This Weekend🚨

WB I-80 Bayshore Freeway Closed from 5th St. to 15th St.
👉When: Fri., Oct. 23, 11 p.m. to Mon., Oct. 26, 6 a.m.

🚗Bay Bridge to SF will be severely congested
Consider public transit 🚄, San Mateo or Richmond bridge.
Details at https://t.co/kwD6tvNagG

[511 SF Bay @511SFBay]

ONGOING: Traffic Collision With Injuries and Overturned Vehicle on Southbound I-280 North of Foothill Expy in Los Altos. All Lanes Remain Blocked. https://t.co/5qiX2oKO9T

[511 SF Bay @511SFBay]

ONGOING: Traffic Collision With Injuries and Overturned Vehicle on Southbound I-280 North of Foothill Expy in Los Altos. All Lanes Remain Blocked. https://t.co/5qiX2oKO9T

[511 SF Bay @511SFBay]

UPDATE: Residual Delays on Westbound CA-92 at San Mateo Bridge - High Rise in Foster City. All Lanes Open.

[Caltrans District 4 @CaltransD4]

Are You Driving to San Francisco This Weekend from East Bay via Bay Bridge?

🚨Major Delays Expected Due to WB I-80 Closure between 5th & 15th
👉When? Friday, Oct. 23, 11 p.m. to Monday, Oct. 26, 6 a.m.
Take public transit. Or use San Mateo, Dumbarton, or Richmond-SR bridge.

[511 SF Bay @511SFBay]

UPDATE: Traffic Collision on Westbound CA-92 at San Mateo Bridge - High Rise in Foster City. Left and Center Lanes Blocked. https://t.co/5qiX2oKO9T

[511 SF Bay @511SFBay]

BART 20 Minute Delay on the San Francisco Line in All Directions, Due to Police Activity. https://t.co/5qiX2oKO9T

[Caltrans District 4 @CaltransD4]

Plan ahead Contra costa county @CA_Brentwood @CHP_ContraCosta @CoCoSheriff @cccpublicworks @511ccta @CCCounty @cccta @KCBSAMFMTraffic

[Caltrans District 10 @CaltransDist10]

#PlanAhead #Stockton #DiscoveryBay Additional 36-hour full closure of SR-4 from Roberts Road to SJ/CC County line scheduled to begin at 10pm, Fri., Oct. 23 until 10am, Sun., Oct. 25, 2026. See detour route below.

[San Francisco Department of Emergency Management @SF_emergency]

Heads up: @CaltransD4 plans to close all westbound I-80 lanes between 5th and 15th streets this weekend from Friday, 10/23 at 11 p.m. through Monday, 10/26 at 6 a.m.

5th Street is the last exit before the closure. Plan your route before heading out and allow extra travel time.

Detours and project updates: https://t.co/91xrzy5Ml1
Current traffic conditions: https://t.co/ujFA7JrWJn or https://t.co/UwrdNcGjFN

The schedule is weather-dependent. Check for updates before you travel.

[Caltrans District 4 @CaltransD4]

👋The Big WB I-80 Weekend Closure Is Coming Oct. 23-26

👉Avoid Driving Bay Bridge into SF👈 Use Alt. Rte.

✴️If you must drive, expect delays and detours:
Detour Video:
https://t.co/gBb1Odm7Wq
@511SFBay @SFMTA_Muni @sfcta

[Caltrans District 4 @CaltransD4]

Traffic Advisory | Daytime Lane Reduction TOMORROW and THURSDAY.

WHERE: Los Gatos — ONE LANE will close on NB SR-17 between Main Street and the SR-9 connector ramp.

WHEN: 9:30 a.m. to 2:30 p.m. this Wednesday, Oct. 21 and Thursday, Oct. 22

📍Check https://t.co/Ro4n035P72

[Caltrans District 4 @CaltransD4]

Driving to SF this Weekend - October 23-26?

🚨PLAN AHEAD: WB I-80 between 5th & 15th streets will be closed, 10/23, 11pm - 10/26, 6am.

✴️Take public transit, or alt. route: San Mateo, Dumbarton, or Richmond-San Rafael bridges.

👉If you drive, expect delays, traffic & detours:

[511 SF Bay @511SFBay]

Traffic Collision and Overturned vehicle on Westbound CA-12 at Kelly Rd in Napa. All Lanes Blocked. https://t.co/5qiX2oKO9T

[Caltrans District 4 @CaltransD4]

Caltrans is doing its part to help get California to #ZeroLitter, like cleaning up this mess at CA-84’s Newark Blvd. exit in Newark. Please do your part by creating no new litter. 💙🚮 #CleanCA @CAgovernor @CA_Trans_Agency @CaltransHQ

[Caltrans District 4 @CaltransD4]

🚨Attention Contractors & Small Businesses! Caltrans District 4 will host a virtual MANDATORY Pre-Bid Meeting for Project 04-4Q3214 on Thursday, October 22, 2026 @ 10:00 AM.

Register at: https://t.co/KEDrNNF16Q

Questions? Email us at [email protected]

[Caltrans District 4 @CaltransD4]

#TRAFFICALERT: Caltrans will continue its CAPM project along US-101 in @maringov for paving as well as permanent pavement striping this week. For more, see: https://t.co/kGCtwQMX05 @CaltransHQ @MarinSheriff

[KCBS Radio - The Traffic Leader @KCBSAMFMTraffic]

#Concord #PleasantHill -- Northbound #Interstate680 is closed before Willow Pass Road due to a head-on crash caused by a wrong way driver. Traffic being diverted onto #Highway242. (Photo: @CaltransD4) #KCBSTraffic.

[Caltrans District 4 @CaltransD4]

✨Reopened! All SB U.S. 101 Bayshore Freeway (Hospital Curve) lanes & One NB Lane Reopened

👏Many thanks to outstanding weekend crew who worked around the clock to complete project ahead of schedule.
👉Grinding operations to begin in weeks to smooth out the road on NB US 101.

[Caltrans District 4 @CaltransD4]

Some images from Sunday from the US-101 Bayshore Freeway (Hospital Curve) closure in SF. Caltrans Maintenance crews are helping in the closure too, cleaning out drainage inlets as prep for this upcoming winter. For detours and other info, visit https://t.co/kwD6tvNagG

[511 SF Bay @511SFBay]

UPDATE: Residual Delays on Southbound I-880 at Mission Blvd in Fremont. All Lanes Open.