On November 14, 2025, at approximately 0200 hours, in Fresno, California, I was driving southbound on Highway 99 at approximately 70 mph using cruise control. It was raining heavily at the time, and visibility was significantly reduced. I was traveling in the middle lane when I suddenly felt what I believed to be an impact on the driver side of my vehicle. Due to the weather conditions, I was unable to visually identify what struck the vehicle. Immediately prior to this event, I noticed faint headlights in lane 1 (fast lane), but I could not determine whether that vehicle made contact with mine. At the moment of the perceived impact, the side curtain airbags deployed unexpectedly. I initially thought the deployment was a collision with another vehicle because the force felt like a physical impact. Once the curtain airbags deployed, I immediately lost control of the vehicle. Steering became impossible, and the vehicle veered off the roadway, ultimately coming to a stop on an embankment adjacent to the highway. California Highway Patrol officers responded to the scene, took my statement, and inspected the vehicle. They reported no exterior body damage consistent with a collision. The following day, I visited the tow yard and conducted a daylight inspection of the vehicle, confirming that there was no visible impact damage on the body panels or exterior surfaces. After the on-scene investigation, the vehicle was towed, and the responding officer provided me with a courtesy r