Altadena, CA – Multi-Vehicle Accident at I-5 & SR-170 Con.

Altadena, CA (February 10, 2026) – A multi-vehicle injury collision was reported on February 9 along southbound Interstate 5 near the SR-170 South connector, prompting a significant emergency response and multiple lane closures.

Initial dispatch information indicated a crash involving as many as two to four vehicles near Exit 153. Authorities later confirmed that at least two vehicles were involved, with additional reports suggesting up to three vehicles collided near the gore point separating the connector lanes.

Key Details

• Location: I-5 S at SR-170 S Connector (Exit 153)
• City: Altadena, CA
• Incident Type: Injury accident
• Response: CHP and emergency crews on scene

What We Know So Far

California Highway Patrol units responded to reports of a collision blocking the center lanes of southbound I-5. Updates from the scene described vehicles with major front-end damage positioned in the No. 2 and No. 3 lanes, with additional reports of vehicles blocking the No. 1 lane.

Los Angeles Fire Department personnel were requested after at least one party complained of chest pain and was reportedly unable to exit their vehicle. An ambulance was dispatched to the scene. Towing services were also requested to remove damaged vehicles and clear the roadway.

Traffic conditions were heavily impacted as responders worked within the connector area. At one point, Freeway Service Patrol units advised they were delayed due to a traffic break while attempting to access the crash site.

What’s Not Yet Confirmed

Officials have not released the total number of victims who were injured. The sequence of events leading up to the collision remains under investigation.

Local Context

Ramp-related collisions near busy exits in Altadena can cause significant disruption as vehicles attempt to merge or stop abruptly. Connector points between I-5 and SR-170 often experience dense merging traffic, increasing the risk of multi-vehicle crashes during sudden slowdowns.

What to Do Next

Remain at the scene and follow instructions from responders. Seek medical evaluation even if symptoms seem minor, as some injuries may not appear immediately after a collision.

FAQ

Why are I-5 accidents often associated with heavy traffic delays?

Interstate 5 is one of California’s busiest corridors. When lanes are blocked, especially near connector ramps, congestion can build quickly and extend for miles.

What do responders do first when an accident happens on I-5?

First responders typically secure the scene, assess injuries, request medical assistance if needed, and manage lane closures to prevent additional collisions.

Why can symptoms appear hours or days after an accident?

Adrenaline can temporarily mask pain. Soft tissue injuries, concussions, and internal injuries may take time to produce noticeable symptoms.