Learn About Filing FMCSA Safety Complaints

What FMCSA Safety Complaints Are and Why They Matter

The Federal Motor Carrier Safety Administration (FMCSA) is a division of the U.S. Department of Transportation. This agency creates and enforces safety rules for commercial trucks and buses that travel on public roads. The FMCSA has authority over motor carriers—companies that operate commercial vehicles with a gross vehicle weight rating (GVWR) of 10,001 pounds or more.

Safety complaints to the FMCSA are reports about violations of federal motor carrier safety regulations. These complaints can involve many issues: unsafe driving practices, mechanical problems with vehicles, drivers working excessive hours, improper cargo handling, falsified logbooks, or lack of proper safety equipment. According to FMCSA data, the agency received over 15,000 safety complaints in 2022 alone, showing that this is an active and widely-used reporting channel.

The complaint process exists because unsafe commercial vehicles pose real dangers. Large trucks are involved in fatal crashes at rates higher than other vehicles. When a truck is not properly maintained or a driver is fatigued, the risk to everyone on the road increases. Complaints from drivers, other motorists, company employees, and the public help the FMCSA identify carriers that may be breaking safety laws.

Understanding the complaint process is valuable for several groups: truck drivers who witness unsafe practices at their company, members of the public who see violations on the road, dispatchers concerned about safety pressures they face, and employees at motor carrier companies. Learning how complaints work helps people understand what happens after they report a safety concern.

Practical Takeaway: FMCSA safety complaints are official reports about violations of federal trucking safety rules. The agency investigates these complaints and takes enforcement action when violations are found, making the process a meaningful way to report safety concerns about commercial vehicles.

How to File an FMCSA Safety Complaint

Filing a complaint with the FMCSA is straightforward. The agency offers multiple ways to submit a report, giving people options based on their situation and preference.

The primary method is through the FMCSA website at safetycomplaints.fmcsa.dot.gov. This online form allows you to enter detailed information about the safety concern. You will need to provide information about the carrier or vehicle involved—such as the company name, truck number or license plate, or driver information if known. You should also describe what safety violation occurred, when you observed it, and where it happened. The more specific details you provide, the more useful your complaint becomes to investigators.

The FMCSA also accepts complaints by phone at 1-888-DOT-SAFT (1-888-368-7238). This hotline operates during business hours and allows you to speak with someone who can record your complaint. This method can be helpful if you prefer not to use a computer or have questions about the process.

You can also mail written complaints to the FMCSA Office of Safety Assurance at 1200 New Jersey Avenue SE, Washington, DC 20590. Include as much detail as possible about the incident, the carrier, and the nature of the safety violation.

Important note: The FMCSA does not require you to provide your name or contact information when filing a complaint. You may file anonymously. However, if you do provide your information, the agency may contact you for additional details about your complaint.

Practical Takeaway: You have three main ways to file an FMCSA safety complaint—online through their website, by phone at 1-888-DOT-SAFT, or by mail. Anonymous complaints are permitted, and providing specific details about the violation increases the likelihood that investigators will be able to act on your report.

Types of Safety Violations You Can Report

The FMCSA enforces safety regulations across many categories. Understanding what counts as a reportable violation helps you know when filing a complaint is appropriate.

Driver-related violations include excessive hours of service, which is when drivers work beyond the legal limits set by federal law. Drivers are generally limited to 11 hours of driving in a 14-hour workday and must take a 10-hour break between work periods. Violations also include impaired driving, reckless driving, and unsafe speed. Another serious category involves logbook fraud, where drivers or companies falsify records about hours worked or vehicle inspections.

Vehicle maintenance violations occur when trucks are not properly maintained. Examples include defective brakes, worn tires, non-functioning lights, missing safety equipment, or mechanical issues that make the vehicle unsafe. The FMCSA requires carriers to maintain their vehicles in safe operating condition and conduct regular inspections.

Hazardous materials violations involve improper handling, loading, or transportation of dangerous goods. This includes chemicals, fuels, pharmaceuticals, and other regulated substances that require special handling and documentation.

Safety management violations include failures to maintain driver records, conduct background checks, or train drivers properly. Carriers must document that drivers are medically certified to drive and that they have appropriate licensing.

On-road violations involve behaviors you might observe while driving. These include tailgating, aggressive lane changes, improper passing, distracted driving, or other unsafe driving practices that endanger other motorists.

You can also report violations related to cargo securement—when loads are not properly tied down or protected—and violations involving passenger safety for bus operators.

Practical Takeaway: Report violations in these categories: driver hours and logbook issues, vehicle maintenance, hazardous materials handling, safety management failures, unsafe on-road behavior, and improper cargo securing. The more specific you can be about the type of violation, the better.

What Information to Include in Your Complaint

Providing detailed and accurate information significantly improves the usefulness of your complaint. The FMCSA investigators need sufficient details to identify the carrier, locate records, and determine whether a violation occurred.

Carrier identification information is essential. If you know the company name, provide it. If you observed the vehicle on the road, note the truck number or license plate, which is usually displayed on the side or back of the truck. The FMCSA can use this information to identify which carrier operates the vehicle. If you know the driver's name or employee ID number, that helps too.

Describe the violation in clear, specific terms. Rather than saying "unsafe driving," explain what you observed: "The driver was eating and holding a cell phone while steering with one hand on I-95" or "The truck had a flat tire and was pulling to one side while traveling at 60 mph." Specific descriptions help investigators understand exactly what regulation may have been violated.

Include the date and time of the incident if possible, or at least the approximate timeframe. Note the location where the violation occurred—the specific highway, road name, city, or mile marker. If the incident happened at a company facility, note the address.

Explain how you observed the violation. Were you driving behind the truck? Did you work for the company? Did you see this as a one-time incident or an ongoing practice? If you have multiple examples, mentioning that pattern is valuable.

Include any documentary evidence you have. If you took photos or video, you can often attach these to online complaints. If you have written records, dates, or other documentation, mention these in your complaint.

Practical Takeaway: Include the carrier name or truck number, a specific description of the violation, the date and location, and how you observed it. Detailed information helps investigators verify the complaint and take appropriate action.

Understanding How FMCSA Investigates Complaints

After you file a complaint, the FMCSA does not investigate every report with the same level of intensity. The agency prioritizes complaints based on the severity of the safety risk and available resources.

The FMCSA first screens complaints to determine if they fall within the agency's authority. Complaints must involve commercial motor carriers regulated by the FMCSA. Complaints about private vehicles, delivery services under a certain size, or other transportation modes fall outside FMCSA jurisdiction and are referred to other agencies if appropriate.

High-priority complaints—those describing imminent safety hazards, multiple violations, or serious incidents—receive faster attention. For example, a complaint about a driver operating a truck