How Do Federal Trucking Regulations Affect an Arizona Truck Accident Claim?

Big-rig accidents are some of the most serious crashes on Arizona roads. When a semi-truck, 18-wheeler, or commercial vehicle is involved, the legal process looks very different from a typical car accident. That's because trucking companies and drivers must follow a complex web of federal regulations — and violations of those rules can play a major role in your injury claim.

This guide breaks down the key federal rules, how Arizona law layers on top of them, and what you should do if you've been hurt in a truck crash.

What Federal Agency Governs Commercial Trucks?

The Federal Motor Carrier Safety Administration (FMCSA) sets the national rules for commercial trucking. These rules apply to trucks operating across state lines and, in many cases, to trucks operating entirely within Arizona as well. The FMCSA regulations cover nearly every aspect of trucking, including:

• Driver qualifications — minimum age, commercial driver's license (CDL) requirements, and background checks
• Hours of service (HOS) — limits on how long a driver can operate before taking mandatory rest breaks
• Vehicle maintenance — regular inspection and repair requirements for brakes, tires, lights, and other safety systems
• Cargo securement — rules for how freight must be loaded and tied down
• Drug and alcohol testing — mandatory pre-employment and random testing programs

When a trucking company or driver breaks any of these rules and an accident results, that violation can be used as evidence of negligence in a personal injury claim.

Hours of Service: A Leading Cause of Truck Crashes

One of the most important FMCSA rules is the hours-of-service limit. Drowsy driving is a well-documented danger, and the HOS rules are designed to prevent it. Under current federal rules:

• Truck drivers may drive a maximum of 11 hours after 10 consecutive hours off duty.
• Drivers cannot drive beyond the 14th consecutive hour after coming on duty.
• A 30-minute break is required after 8 cumulative hours of driving without at least a 30-minute interruption.
• A 60/70-hour limit applies over 7 or 8 consecutive days.

Drivers are required to keep electronic logging device (ELD) records of their hours. If those logs show a driver was over the legal limit at the time of your crash, that evidence can be critical to your case. Connect with our intake team to learn more about gathering this evidence.

Arizona-Specific Laws That Apply to Truck Accidents

Arizona follows a pure comparative fault rule under Arizona Revised Statutes § 12-2505. This means that even if you were partially at fault for the accident, you can still recover damages — but your compensation is reduced by your percentage of fault. For example, if you were found 20% at fault, you'd receive 80% of your total damages.

For filing a lawsuit, Arizona's statute of limitations for personal injury is generally two years from the date of the accident (A.R.S. § 12-542). Missing this deadline almost always means losing your right to sue. However, cases involving government-owned trucks or government contractors may have shorter notice requirements — confirm exact deadlines with a licensed Arizona attorney.

Arizona also has its own commercial vehicle weight and size regulations enforced by the Arizona Department of Transportation (ADOT), which can add another layer of liability if a truck was overloaded or improperly permitted.

Who Can Be Held Liable After a Truck Accident in Arizona?

Truck accident cases are complex because multiple parties may share responsibility:

• The truck driver — for speeding, distracted driving, or HOS violations
• The trucking company — for negligent hiring, inadequate training, or pressuring drivers to skip rest breaks
• The cargo loading company — if improperly secured freight caused the crash
• The truck manufacturer — if a defective part like faulty brakes contributed
• A maintenance contractor — if poor repairs led to a mechanical failure

Identifying all liable parties matters because it can significantly affect the total compensation available to you.

What Evidence Is Most Important in a Truck Accident Claim?

Evidence in a truck accident case goes far beyond photos of the crash scene. Key records to preserve include:

• Electronic logging device (ELD) data showing driver hours
• Black box (ECM) data recording speed, braking, and engine activity before impact
• Driver qualification files — CDL records, drug test results, employment history
• Maintenance and inspection logs for the vehicle
• Cargo manifest and weight tickets
• Dash cam or surveillance footage

Trucking companies are not always eager to hand over these records. An attorney can send a spoliation letter — a legal notice requiring the company to preserve evidence — shortly after the crash. Time is critical. Start a free intake now to get guidance on protecting your evidence.

Frequently Asked Questions

How long do I have to file a truck accident lawsuit in Arizona?

In most personal injury cases, Arizona law gives you two years from the date of the accident. Cases involving government vehicles may have shorter deadlines. Don't wait — evidence disappears and deadlines are firm.

Does it matter if the trucking company is based in another state?

Not necessarily. Because trucking is regulated at the federal level, the same FMCSA rules apply regardless of where the company is headquartered. Arizona courts can still hear your case if the accident happened in the state.

Can I still recover compensation if I was partly at fault?

Yes. Arizona's pure comparative fault rule means you can recover damages even if you were partially responsible. Your award is simply reduced by your percentage of fault.

What if the truck driver was an independent contractor?

Trucking companies sometimes classify drivers as independent contractors to limit liability. However, courts and regulators look at the actual working relationship. If the company controlled how the driver operated, they may still be held responsible. This is a fact-specific question — confirm with a licensed attorney.

How much is my truck accident case worth?

Every case is different. Compensation can include medical bills, lost wages, pain and suffering, and future care costs. No attorney or tool can guarantee a specific outcome. What matters is building the strongest possible case with solid evidence.

Truck accident claims involve federal law, state law, multiple defendants, and a well-funded insurance industry working against you from day one. The more you understand your rights, the better positioned you are to protect them.

Talk to our 24/7 AI to see if you have a strong case — free, no obligation. → Start free intake