A truck stopped on the shoulder is one of the most dangerous places on a California highway. A 2026 change to state law aims to reduce that risk by requiring passing drivers to give stopped vehicles more room. For truckers and the people around them, it also shapes how liability is decided after a roadside crash.
What Changed on January 1, 2026
California’s “Slow Down, Move Over” law used to apply only to emergency vehicles, tow trucks, and Caltrans crews stopped with flashing lights. Assembly Bill 390 expanded it. As of January 1, 2026, drivers must move over or slow down for any stopped vehicle showing hazard lights or warning devices. That now includes a disabled big rig on the shoulder.
Why This Matters for Truck Accidents
Roadside and shoulder collisions are a serious category of truck crash. A driver who fails to move over can strike a stopped truck, a driver changing a tire, or a tow operator loading a wreck. The law now sets a clear duty in those moments, and a violation can help establish who can be held liable when someone is hurt.
The change follows a sharp rise in roadside deaths, which federal data put at roughly a 77% increase.
Duties That Run Both Ways
The rule applies to commercial drivers too. A trucker who does not slow or move over for a stranded motorist now faces the same duty as any other driver. Understanding how these crashes happen helps explain why the shoulder is so hazardous.
Federal rules already require warning devices when a commercial vehicle stops on the roadway. Federal rules for truckers and the expanded state law work together to protect anyone near a stopped truck.
After a shoulder crash, several questions shape the case:
- Did the passing driver move over or slow down?
- Did the stopped truck show hazard lights or warning devices?
- Was the truck legally stopped or blocking a lane?
- What injuries resulted and who caused them?
What This Means for a California Truck Accident Claim
For anyone hurt in a California truck accident on the shoulder, the expanded law can be strong evidence of fault. If a driver ignored hazard lights and hit a stopped truck, that failure supports a negligence claim. Solid evidence that supports a claim, from dashcam footage to police reports, often decides the outcome.
A closer look at California truck accident laws covers the wider state framework.
Serious roadside crashes also call for careful valuation. Knowing how damages are calculated helps you weigh any offer after a California truck accident.
Moving Forward After a Roadside Crash
The expanded Move Over law gives stranded drivers and truckers more protection, but it does not undo the harm a high-speed shoulder crash can cause. If you were hurt in one, the team at Truck Law can review the facts and explain who may be responsible for your injuries.