Fatal Multi-Vehicle Collision Disrupts San Diego Traffic

Scene of a multi-vehicle collision on State Route 805 with a big rig and emergency response units.

San Diego, December 9, 2025

A significant multi-vehicle crash involving a big rig occurred early Sunday morning on northbound State Route 805, causing major traffic disruptions. Authorities issued a SigAlert to close the transition road to northbound State Route 15. Investigations are ongoing to uncover the circumstances surrounding the accident. This tragic incident emphasizes the critical need for road safety in San Diego. Highway safety agencies are working diligently to determine the causes and prevent future occurrences.

Fatal Multi-Vehicle Collision on State Route 805 Disrupts San Diego Traffic

A big rig accident early Sunday morning on SR-805 raises concerns about road safety.

San Diego, CA – A tragic multi-vehicle collision involving a big rig occurred early Sunday morning on northbound State Route 805, resulting in a significant traffic disruption as authorities seek to uncover the details surrounding the incident. The crash happened at approximately 2:50 a.m., prompting a SigAlert to be issued shortly thereafter, effectively closing the transition road connecting northbound SR-805 to northbound State Route 15.

This incident highlights the critical importance of road safety in a bustling urban environment like San Diego, where increased traffic can lead to serious accidents. The resilience and determination of local public safety agencies, including the California Highway Patrol, pave the way for ongoing investigations to examine the underlying factors contributing to such tragic events.

Details of the Incident

The collision involved multiple vehicles, prominently featuring a big rig, along the northbound lanes of State Route 805, just south of University Avenue. While the exact circumstances leading to the crash remain under investigation by the California Highway Patrol, the initial response included a timely issuance of a SigAlert at 3:37 a.m., which halted the connection from northbound SR-805 to northbound State Route 15. This closure resulted in notable traffic disruptions for early morning commuters.

Background Information

Multi-vehicle collisions, particularly those involving large trucks like big rigs, present substantial risks not just to those directly involved but also to the surrounding community. These incidents can lead to long-lasting disruptions on primary traffic routes, emphasizing the need for stringent oversight and robust safety protocols. The California Highway Patrol is dedicated to determining the causes of such accidents to prevent similar occurrences in the future, while ensuring that drivers remain informed and vigilant.

Related Incidents

San Diego has seen a number of traffic-related incidents recently, each incident further underscoring the importance of safety on the roads. For example, a fatal crash in July on State Route 163 involved multiple vehicles, resulting in one death and one injury. In August, a two-vehicle collision in Chula Vista led to two fatalities and three injuries. These events serve as a reminder of the need for caution and proactive measures by both drivers and traffic authorities alike.

Safety Recommendations

In response to a series of tragic traffic incidents, it’s vital for drivers to adhere to established traffic laws, remain alert to their surroundings, and particularly exercise caution when navigating around larger vehicles such as big rigs. Maintaining a safe following distance, adhering to speed limits, and staying focused can significantly lower the risk of accidents occurring. Moreover, authorities encourage the reporting of any unsafe driving behaviors to promote road safety for all users.

Contact Information

For more information or to raise traffic-related concerns, individuals can reach out to the California Highway Patrol’s San Diego office at 858-293-6000. Ensuring open lines of communication and adherence to regulations is essential for fostering a safe driving environment in San Diego.

FAQ

What happened in the multi-vehicle crash on State Route 805?

A fatal multi-vehicle collision involving a big rig occurred early Sunday morning on northbound State Route 805, south of University Avenue. The exact circumstances leading to the crash are under investigation by the California Highway Patrol.

What is a SigAlert, and why was it issued?

A SigAlert is a traffic advisory issued by the California Highway Patrol to inform the public of significant traffic incidents or hazards. In this case, a SigAlert was issued at 3:37 a.m., closing the transition road connecting northbound SR-805 to northbound State Route 15 due to the collision.

Have any details about the victims been released?

As of now, no additional information regarding the victims or the cause of the accident has been provided by authorities. The investigation is ongoing, and further details may be released once available.

What should drivers do in response to this incident?

Drivers are advised to stay informed through official channels and exercise caution when traveling in the area. Adhering to traffic laws, maintaining a safe following distance, and staying alert can help prevent accidents.

How can I contact the California Highway Patrol for more information?

For more information or to report traffic-related concerns, individuals can contact the California Highway Patrol’s San Diego office at 858-293-6000.

Key Features of the Incident

Feature Details
Location Northbound State Route 805, south of University Avenue, San Diego, CA
Time of Incident Approximately 2:50 a.m. on Sunday, December 7, 2025
Vehicles Involved Multiple vehicles, including a big rig
Traffic Advisory SigAlert issued at 3:37 a.m., closing the transition road to northbound State Route 15
Investigation Status Ongoing by the California Highway Patrol; no further details released

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HERE Resources

Fatal Multi-Vehicle Crash Involving Big Rig on I-805
Fatal Multi-Vehicle Crash Involving Big Rig on I-805
Fatal Multi-Vehicle Crash Involving Big Rig on I-805
Fatal Multi-Vehicle Crash Involving Big Rig on State Route 805
Fatal Multi-Vehicle Crash Involving Big Rig on I-805
Fatal Multi-Vehicle Crash Involving Big Rig on State Route 805
Fatal Multi-Vehicle Crash Involving Big Rig on I-805
Fatal Multi-Vehicle Crash Involving Big Rig on I-805
Fatal Multi-Vehicle Crash Involving Big Rig on I-805
Fatal Multi-Vehicle Crash Involving Big Rig on I-805

STAFF HERE SAN DIEGO WRITER
Author: STAFF HERE SAN DIEGO WRITER

The SAN DIEGO STAFF WRITER represents the experienced team at HERESanDiego.com, your go-to source for actionable local news and information in San Diego, San Diego County, and beyond. Specializing in "news you can use," we cover essential topics like product reviews for personal and business needs, local business directories, politics, real estate trends, neighborhood insights, and state news affecting the area—with deep expertise drawn from years of dedicated reporting and strong community input, including local press releases and business updates. We deliver top reporting on high-value events such as Comic-Con International, San Diego County Fair, and San Diego Pride Festival. Our coverage extends to key organizations like the San Diego Regional Chamber of Commerce and United Way of San Diego County, plus leading businesses in biotechnology, healthcare, and technology that power the local economy such as Qualcomm, Illumina, and Scripps Health. As part of the broader HERE network, including HEREAnaheim.com, HEREBeverlyHills.com, HERECostaMesa.com, HERECoronado.com, HEREHollywood.com, HEREHuntingtonBeach.com, HERELongBeach.com, HERELosAngeles.com, HEREMissionViejo.com, and HERESantaAna.com, we provide comprehensive, credible insights into California's dynamic landscape.

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