Jackknifed Semi-Tractor Trailer Blocked Three Northbound I-5 Lanes in Oceanside, Disrupting SR-76 Traffic

What happened and where

A crash involving a semi-tractor trailer blocked multiple lanes of northbound Interstate 5 in Oceanside early Wednesday, February 11, 2026, triggering major disruptions during the morning commute. Authorities said the truck and trailer jackknifed on northbound I-5 just south of Harbor Drive at about 5:15 a.m.

The incident left three northbound lanes blocked, reducing freeway capacity at a key North County chokepoint near the State Route 76 interchange. In addition to slowing I-5 traffic, the lane closures created spillover impacts for motorists traveling toward westbound SR-76, a primary route connecting inland North County to coastal Oceanside.

Immediate impacts: lanes blocked, congestion and delays

Lane blockages of this scale can quickly generate stop-and-go conditions and extended backups, particularly during peak commuting hours. With three northbound lanes obstructed, drivers approaching from the south encountered significant slowdowns while traffic was routed around the jackknifed rig.

• Location: northbound I-5, just south of Harbor Drive in Oceanside
• Time reported: approximately 5:15 a.m. Wednesday, Feb. 11, 2026
• Traffic conditions: three northbound lanes blocked; SR-76 westbound traffic also affected

Injuries and investigation status

As of the latest available official update, no injuries had been reported. Investigators were working to determine what led to the jackknife. No cause has been confirmed publicly, and authorities have not announced whether other vehicles were involved.

Authorities said the truck and trailer jackknifed for reasons that had not yet been determined, blocking three lanes on northbound I-5.

What drivers should know

When large commercial vehicles jackknife, the resulting blockage can take time to clear because responders may need specialized towing equipment and may have to manage debris, fuel concerns, or roadway damage before reopening lanes. Drivers traveling through Oceanside on I-5, or connecting to SR-76, were advised to plan for delays and use caution in the area while the investigation and clearance operations continued.