SAN RAFAEL, Marin County, Calif., Sept. 16, 2026 — A multi-vehicle crash involving a box truck and at least two passenger cars blocked lanes on southbound US-101 near Freitas Parkway Tuesday morning, September 15, according to authorities. At least one person was reported injured.
According to radio traffic logged by the California Highway Patrol, a driver first reported hearing the collision from a nearby office window, and dispatchers initially tracked reports of a pickup truck involved with a sedan before updates described a gray Honda, a gray sedan and a white truck involved in the crash. Authorities upgraded the call to an injury collision and requested an ambulance, according to the log.
Radio traffic indicated a gray Honda came to rest on the right shoulder with reported minor injuries, while airbags deployed in the white truck involved. One or more vehicles were reported blocking travel lanes, and a box truck was still blocking at least one lane as of shortly after 11 a.m., authorities said. The exact number of vehicles involved was not immediately confirmed.
A tow response was requested for at least one vehicle, and authorities opened a case to document the crash. The extent of injuries and the cause of the collision remain under investigation, and further details had not been released as of Tuesday.
We wish the injured a complete and speedy recovery.
When Multi-Vehicle Crashes on Freeways Like US-101 Tend to Happen
Multi-vehicle pileups on busy freeway corridors cluster around the hours when traffic volume is heaviest and following distances shrink, particularly the morning commute and the evening rush. Slower-moving or braking vehicles at the back of a traffic slowdown create the first collision, and vehicles following behind often don't have enough space or time to stop before adding to it.
Weather and glare play a role too. Morning sun angled low over the roadway, sudden rain after a dry stretch, or fog settling into low-lying corridors can all cut visibility right when traffic is densest. Mixing large commercial trucks with passenger vehicles during these periods adds another layer of risk, since trucks take longer to slow down and can obscure sightlines for drivers around them.
Weekday mid-morning and afternoon commutes see a steady mix of commercial and passenger traffic merging and changing lanes, which raises the odds of a chain-reaction crash whenever one vehicle brakes hard or stops unexpectedly. According to the Insurance Institute for Highway Safety, 17,008 motor-vehicle crash deaths occurred outside passenger vehicles in crashes involving passenger vehicles in 2023.
Frequently Asked Questions
Does driver fatigue contribute to truck crashes?
Fatigue is a recognized factor in commercial truck crashes, particularly on long-haul routes or during early morning and late-night hours when alertness naturally dips. Federal rules limit driving hours for this reason, though fatigue can still play a role even within those limits.
What should I do after a crash involving a commercial truck?
Move to a safe location if possible, call 911, and wait for law enforcement to document the scene. Get checked by a medical provider even if injuries seem minor, since some symptoms take hours to appear.
Why do large trucks need more room to stop than cars?
Their size and loaded weight mean trucks require substantially longer stopping distances than passenger vehicles, especially at highway speeds or in wet conditions. That extra distance is why sudden slowdowns in truck-heavy traffic can trigger chain-reaction collisions.
What makes crashes with commercial trucks more dangerous than typical car crashes?
The size and weight difference between a truck and a passenger vehicle means occupants of the smaller vehicle absorb more of the force in a collision, often leading to more severe injuries than a crash between two similarly sized cars.
What to Do After a Multi-Vehicle Crash in San Rafael, CA
If you're involved in a multi-vehicle crash, stay in your vehicle if it's unsafe to exit into traffic, and turn on hazard lights if they still work. Check yourself and passengers for injuries before checking on others nearby, and call 911 right away to get medical help and law enforcement moving toward the scene.
Once you're safe, exchange information with other drivers involved and take photos of vehicle positions and damage if you're able. Even if you feel fine, a medical evaluation in the following day or two is worth doing, since injuries like whiplash or concussion don't always show symptoms immediately. Keep any paperwork from the scene, including the responding agency's case number, for your records.
