SANTA BARBARA COUNTY, California — A crash involving two semi-trucks and a passenger vehicle shut down southbound Highway 101 north of Sheffield Drive early Thursday, September 24, 2026, after diesel spilled across the roadway.
California Highway Patrol incident data shows the collision was first reported at approximately 1:40 a.m. on southbound U.S. 101 in the Santa Barbara/Montecito area.
Early reports indicated that two semis had collided in the fast lane and that another vehicle was involved. CHP later characterized the incident as a three-vehicle property-damage crash involving two semis and one additional vehicle.
The accident forced authorities to shut down access to southbound Highway 101 near San Ysidro Road while traffic was diverted toward Jameson Lane and back onto the freeway near Sheffield Drive.
What Happened on Highway 101 Near Sheffield Drive?
CHP’s incident log says the first report came in at approximately 1:40 a.m.
Dispatch information initially described:
- two semi-trucks colliding and blocking the fast lane;
- an additional vehicle producing smoke;
- and a red Lexus RX350 associated with an automated crash notification.
Emergency information initially classified the crash as involving unknown injuries.
As officers investigated, CHP updated the incident to a no-injury, property-damage collision and confirmed that three vehicles were involved: two semis and one additional vehicle.
Highway 101 Santa Barbara Crash Details
| Incident Detail | Latest Confirmed Information |
|---|---|
| Road | U.S. Highway 101 |
| Direction | Southbound |
| Location | North of Sheffield Drive, Santa Barbara/Montecito area |
| Date | September 24, 2026 |
| First Reported | About 1:40 a.m. |
| Vehicles Involved | Three |
| Semi-Trucks | Two |
| Additional Vehicle | One passenger vehicle |
| Lexus Mentioned | Red Lexus RX350 in initial dispatch information |
| Injuries | CHP ultimately classified incident as no injury |
| Fuel Spill | Yes |
| Estimated Diesel Spill | Less than 50 gallons, according to fire personnel relayed through CHP |
| Waterway Impact | None reported |
| Southbound Closure | Yes |
| Primary Investigating Agency | California Highway Patrol |
| Incident ID | 260924VT0012 |
Diesel Spill Forces Extended Highway Closure
The collision damaged a fuel tank on one of the trucks.
CHP dispatch notes said fuel was spread across the roadway and that one tank had been punctured.
Fire personnel later estimated that less than 50 gallons had spilled and reported no impact to waterways. The tank was reportedly continuing to leak slowly during the response.
Because of the spill and damaged vehicles, officials expected the highway closure to last significantly longer than a routine collision cleanup.
An updated CHP entry said the southbound roadway could remain closed for approximately five hours because of the diesel spill.
Southbound Highway 101 Closed Near San Ysidro Road
CHP requested that the San Ysidro Road entrance to southbound Highway 101 be shut down while emergency crews handled the collision.
Authorities coordinated with the Santa Barbara County Sheriff’s Office and other agencies to control traffic.
Traffic was being redirected through the local road network, with CHP discussing a diversion using Jameson Lane before motorists could return to southbound Highway 101 around Sheffield Drive.
Heavy tow trucks were also requested because of the size of the vehicles involved.
Was Anyone Injured?
Early dispatch information created concern about possible injuries.
The crash-detection system associated with the red Lexus reportedly indicated that the vehicle’s occupant was not responding, and CHP temporarily changed the classification from no injury to unknown injury.
However, subsequent information from officers at the scene changed the incident back to Traffic Collision — No Injury.
CHP ultimately described it as a three-vehicle property-damage accident.
No fatality has been reported.
Were Four Cars and Two Semi-Trucks Involved?
No, not according to the latest CHP information.
Some circulating descriptions characterized the collision as involving four vehicles and two semi-trucks, which would suggest six vehicles in total.
CHP’s updated incident log specifically states:
“3 Vehicle Crash 2 Semis And 1 Additional.”
Therefore, the latest verified count is three vehicles total.
Unless CHP later revises that figure, headlines describing six vehicles should be corrected.
Did One of the Semi-Trucks Catch Fire?
Initial emergency communications indicated that one semi might have been catching fire, while another report said smoke was coming from one of the additional vehicles.
Later CHP updates focused on the diesel spill and property damage rather than a confirmed truck fire.
No authoritative information reviewed confirms that a semi became fully engulfed in flames.
Accordingly, the incident should not currently be described as a major vehicle fire.
Heavy-Duty Tow Trucks Called to Scene
Removing two commercial trucks required specialized towing equipment.
CHP requested multiple heavy-duty tow trucks, and dispatch records show operators coordinating access to the crash site from the Sheffield Drive side because of the closure.
At one point, CHP requested a third tow vehicle before further determining what equipment would be required.
Commercial truck crashes can take substantially longer to clear than ordinary passenger-vehicle collisions because of vehicle size, spilled cargo or fuel and potential roadway damage.
Caltrans Responds to Roadway Damage and Closure
Caltrans was also contacted during the incident.
CHP records indicate that traffic-control crews were being sent to establish a harder closure and evaluate possible damage to the K-rail/concrete barrier near the collision scene.
The agency also worked on updating highway message signs.
The Highway 101 corridor through Montecito is already undergoing major construction, including median work between Olive Mill Road and San Ysidro Road. (sbroads.com)
The crash response is separate from those planned construction activities.
Is Highway 101 Still Closed?
In the latest CHP-linked traffic information reviewed Thursday morning, the collision was still listed as an active Highway 101 incident.
The traffic feed showed the southbound crash north of Sheffield Drive remaining on the incident list, with the diesel-spill cleanup expected to require an extended closure.
Because conditions can change rapidly once towing and cleanup are completed, motorists should check live CHP or Caltrans information before traveling through Montecito.
Why the Diesel Spill Matters
Fuel spills can complicate a highway collision even when nobody is injured.
Diesel can make pavement slippery, creating another collision risk, and cleanup crews must prevent fuel from entering storm drains, creeks or environmentally sensitive areas.
In this case, fire personnel reportedly estimated the spill at less than 50 gallons and said waterways were not affected.
State emergency officials were also notified during the response.
Traffic Delays Expected Around Montecito
A prolonged southbound Highway 101 closure can quickly create congestion through the Montecito and Santa Barbara corridor.
Motorists should expect impacts around:
- San Ysidro Road,
- South Jameson Lane,
- Sheffield Drive,
- Olive Mill Road,
- and surrounding local streets being used for diversion traffic.
Drivers should follow CHP and Caltrans instructions rather than attempting to bypass closures through restricted construction areas.
Separate Highway 101 Crashes This Week
The September 24 semi-truck collision should not be confused with other recent Highway 101 crashes in Santa Barbara County.
On September 21, four people were injured in a four-vehicle crash between Los Alamos and Buellton. One vehicle rolled over, and one southbound lane was temporarily closed.
Also on September 21, a separate two-car collision near the Laguna Street exit in Santa Barbara blocked two Highway 101 lanes for roughly 90 minutes.
Those were separate incidents from Thursday morning’s collision near Sheffield Drive.
What Should Drivers Do?
Motorists traveling southbound through Santa Barbara County should check live traffic conditions before approaching Montecito.
Drivers should:
- obey temporary lane and ramp closures;
- follow CHP and Caltrans detours;
- reduce speed near emergency personnel;
- avoid stopping to photograph the crash;
- and allow additional travel time.
Anyone encountering an emergency or dangerous roadway condition should call 911.
Final Highway 101 Accident Update
As of the latest information reviewed on September 24, 2026, CHP confirms a three-vehicle collision involving two semi-trucks and one additional vehicle on southbound Highway 101 north of Sheffield Drive in the Santa Barbara/Montecito area.
The crash was first reported at approximately 1:40 a.m.
A punctured truck fuel tank released diesel across the roadway, with fire personnel estimating that less than 50 gallons spilled and reporting no impact to waterways.
CHP ultimately categorized the crash as a no-injury property-damage collision.
Southbound Highway 101 access near San Ysidro Road was closed, traffic was diverted through the Jameson Lane/Sheffield Drive area, and heavy-duty tow trucks and Caltrans crews were called to the scene.
Officials anticipated an extended closure because of the diesel cleanup.
Frequently Asked Questions
What happened on Highway 101 in Santa Barbara today?
Two semi-trucks and one additional vehicle were involved in a crash on southbound Highway 101 north of Sheffield Drive early September 24.
How many vehicles were involved?
CHP’s latest incident information says three vehicles total — two semis and one additional vehicle.
Were four cars and two semi-trucks involved?
No. That six-vehicle count is not supported by the latest CHP data.
Was anyone injured?
CHP initially investigated possible injuries but ultimately classified the collision as a no-injury property-damage crash.
Why was Highway 101 closed?
A truck’s fuel tank was punctured, spilling diesel across the roadway. Cleanup, towing and traffic-control operations required a southbound closure.
How much diesel spilled?
Fire personnel reportedly estimated the spill at less than 50 gallons, with no waterways affected.
Where did the crash happen?
On southbound Highway 101 north of Sheffield Drive in the Santa Barbara/Montecito area.
Is Highway 101 open now?
The latest CHP-linked traffic information reviewed continued to list the incident as active, with an extended closure anticipated for cleanup. Drivers should check live CHP or Caltrans information before traveling through the area.
Disclaimer
This article reflects live California Highway Patrol incident information reviewed on September 24, 2026. Early dispatch information can change as officers investigate a scene. CHP initially listed possible unknown injuries but later classified the crash as no injury and identified three vehicles total. The vehicle count, roadway status and cleanup timeline should be updated if authorities issue newer information.