DOT-Required Emergency Equipment for Commercial Motor Vehicles

Updated: September 1, 2026 at 9:40 AM

The Federal Motor Carrier Safety Administration (FMCSA) requires trucks, truck tractors, and buses to carry certain required emergency equipment under 49 CFR § 393.95. Depending on the vehicle and operation, DOT-required safety equipment includes a properly rated fire extinguisher, spare fuses when applicable, and approved warning devices such as reflective triangles or fusees.

This equipment helps alert other motorists and gives drivers the tools they need during fires, breakdowns, and other roadside emergencies. Still, not everything commonly found in a truck emergency kit is required by federal law. This guide explains what DOT-required emergency equipment you need, when special rules apply, and which safety items are helpful but not federally required.

Key Takeaways

• FMCSA emergency equipment requirements are primarily found in 49 CFR § 393.95.
• Covered power units must carry a properly rated fire extinguisher that is readily accessible and securely mounted.
• A non-hazmat power unit generally needs one fire extinguisher rated at least 5 B:C or two rated at least 4 B:C each.
• A power unit carrying hazardous materials in quantities that require placarding needs a fire extinguisher rated at least 10 B:C.
• Commercial motor vehicles must carry approved warning devices. Three bidirectional reflective triangles or at least six fusees are the primary options under the current regulation.
• Spare fuses are required when applicable, but vehicles using qualifying circuit breakers are exempt from this requirement.
• First-aid kits and reflective safety vests are useful to carry, but they are not universally required under 49 CFR § 393.95.

What Emergency Equipment Does DOT Require Under 49 CFR § 393.95?

The main federal emergency equipment requirements are found in 49 CFR § 393.95. The regulation applies to each truck, truck tractor, and bus, with an exception for certain units used in driveaway-towaway operations.

The required equipment generally falls into three categories:

• Fire extinguishers
• Spare fuses, when applicable
• Warning devices for stopped vehicles

The exact requirements can depend on the vehicle and what it is hauling. For example, power units carrying placardable hazardous materials need a higher minimum fire extinguisher rating. Some hazmat vehicles are also prohibited from carrying flame-producing warning devices.

Motor carriers should maintain this equipment and make sure it is ready to use. Missing, damaged, or improper emergency equipment can lead to violations during a roadside inspection. In some cases, a violation may contribute to the vehicle being placed out of service.

What Fire Extinguisher Is Required in a Power Unit?

Every truck, truck tractor, and bus covered by 49 CFR § 393.95 must have the required fire extinguisher or extinguishers.

For a power unit that is not transporting hazardous materials requiring placards, the following options meet the minimum ratings:

• One fire extinguisher with an Underwriters Laboratories rating of 5 B:C or higher, or
• Two fire extinguishers, each rated 4 B:C or higher.

A power unit carrying enough hazardous materials to require placarding must have a fire extinguisher with an Underwriters Laboratories rating of at least 10 B:C.

Fire Extinguisher Mounting and Accessibility

Simply having the right fire extinguisher in the truck is not enough. It also needs to be properly mounted and ready for use.

The fire extinguisher required by the regulation must be filled and readily accessible. It must be securely mounted to prevent sliding, rolling, or vertical movement relative to the motor vehicle.

Drivers and inspectors must also be able to tell whether the extinguisher is fully charged. A pressure gauge or other visual indicators can permit visual determination of its condition.

The regulation does not require the extinguisher to be mounted in a specific upright position. What matters is that it is secure, accessible, and protected from movement.

Fire Extinguisher Labels and Extinguishing Agents

Each required fire extinguisher must have the proper manufacturer label or marking showing its Underwriters Laboratories rating.

There are also rules for the extinguishing agent itself. It cannot require protection from freezing. The agent must also comply with the toxicity provisions of the Environmental Protection Agency’s Significant New Alternatives Policy, or SNAP, regulations.

These requirements help make sure the extinguisher remains suitable for use in the conditions a commercial truck may face.

Are Spare Fuses Required Safety Equipment?

Spare fuses are required on some commercial motor vehicles, but the rule does not apply to every truck.

If a vehicle uses fuses for parts and accessories covered by federal motor carrier safety regulations, it must carry at least one spare fuse for each type and size needed.

There is an important exception. Vehicles equipped with circuit breakers that meet the applicable federal requirements do not have to carry those spare fuses.

The rule covers fuses, not replacement light bulbs. Section 393.95 does not create a general requirement for trucks to carry spare bulbs.

What Warning Devices Must a Commercial Motor Vehicle Carry?

Warning devices help approaching traffic see a commercial motor vehicle that has stopped on or near a highway. The signal produced by these devices gives other drivers more time to notice the truck and react safely.

Under the current version of 49 CFR § 393.95, a covered commercial motor vehicle must use one of the following options:

• Three bidirectional emergency reflective triangles that meet Federal Motor Vehicle Safety Standard No. 125, or
• At least six fusees, plus as many additional fusees as needed to satisfy the requirements of 49 CFR § 392.22.

A driver can carry other warning devices as well. However, another device or other signal cannot replace the required warning equipment or make it less effective.

Reflective Warning Triangles

Three bidirectional reflective triangles are a common way to meet the federal warning-device requirement.

The triangles must comply with Federal Motor Vehicle Safety Standard No. 125.

Reflective triangles provide a visible warning without using a flame. That makes them especially useful for vehicles that cannot legally carry flame-producing devices because of their fuel or hazardous cargo.

Requirements for Fusees

A commercial motor vehicle using fusees must carry at least six. The vehicle must also carry as many additional fusees as needed to meet the roadside warning requirements for stopped vehicles.

Each fusee must be capable of burning for 30 minutes.

Federal rules also require fusees to conform to Underwriters Laboratories, Inc., UL No. 912, Highway Emergency Signals, Fourth Edition, with the amendment identified in the regulation. Each fusee must carry the UL symbol as required by UL 912.

What About Liquid-Burning Flares?

Older trucking guides may list liquid-burning flares as an option for DOT emergency warning equipment. The current version of 49 CFR § 393.95(f), however, lists three bidirectional reflective triangles or at least six fusees as the required warning-device options.

This is a good example of why carriers should check the current eCFR instead of relying on an old emergency equipment list. Federal requirements can change over time.

Restrictions on Flame-Producing Devices

Flame-producing devices can create an extra hazard around certain fuels and hazardous materials. FMCSA therefore prohibits them on specific commercial motor vehicles.

Under 49 CFR § 393.95, fusees or other flame-producing signals cannot be carried on:

• A commercial motor vehicle transporting Division 1.1, 1.2, or 1.3 explosive hazardous materials.
• A cargo tank motor vehicle transporting Division 2.1 flammable gas or Class 3 flammable liquid hazardous materials, whether the tank is loaded or empty.
• A commercial motor vehicle using compressed gas as motor fuel.

For these vehicles, drivers should use compliant warning devices that do not produce a flame, such as reflective triangles. Carriers hauling regulated materials should also understand the broader hazmat transportation requirements that apply to their operation.

How Do Warning Devices Work for Stopped Vehicles?

Carrying the right warning devices is only part of staying compliant. Drivers also need to know when and where to use them.

49 CFR § 392.22 covers emergency signals for stopped commercial motor vehicles.

When a CMV stops on the traveled portion or shoulder of a highway for a reason other than a necessary traffic stop, the driver must immediately turn on the vehicle’s hazard warning flashers.

The required warning devices generally need to be placed as soon as possible and within 10 minutes.

Where Should Reflective Triangles Be Placed?

On a typical two-way road, the warning devices are placed:

• About 10 feet from the stopped vehicle on the traffic side.
• About 100 feet from the vehicle in the direction of approaching traffic.
• About 100 feet from the vehicle in the opposite direction.

The rules change on divided and one-way highways. Placement can also change when a truck stops near a curve, hill, or another obstruction that limits visibility.

For example, on a divided or one-way highway, the warning devices are placed toward approaching traffic at approximately 10, 100, and 200 feet.

Drivers should follow the complete requirements in 49 CFR § 392.22. The road and location of the stopped vehicle can affect where the warning devices need to go.

Special Rules for Fusees

Drivers using only fusees must place a lighted fusee at each required location. At least one fusee must continue burning at each location for as long as the commercial motor vehicle remains stopped.

This helps explain why the regulation calls for at least six fusees even though drivers generally use three warning locations.

Before moving the vehicle, the driver must extinguish and remove the fusees.

What About Red Flags?

Red flags still appear in 49 CFR § 393.95. The regulation says they must be at least 12 inches square and have standards adequate to keep them upright.

However, the current warning-device requirements in § 393.95(f) list three bidirectional reflective triangles or at least six fusees as the required options.

Carriers should use the current eCFR when checking which warning devices meet today’s federal requirements.

Do Driveaway-Towaway Operations Need the Same Emergency Equipment?

There is a limited exception for certain driveaway-towaway operations.

Section 393.95 does not apply to a driven unit in a driveaway-towaway operation when that unit is part of a combination, and another vehicle in the combination meets the emergency equipment requirements.

This is a narrow exception. Carriers involved in driveaway-towaway operations should review the current regulation to see how it applies to their specific vehicle combination.

What Emergency Equipment Is Recommended but Not Required by DOT?

Truckers often carry more safety gear than federal regulations require. That’s a good practice, but there is an important difference between useful equipment and equipment that DOT requires under § 393.95.

Does DOT Require a First-Aid Kit?

A first-aid kit is not a universal emergency equipment requirement under 49 CFR § 393.95.

Still, keeping one in the truck can be useful for treating minor injuries while waiting for professional medical help. Many states, employers, customers, or specific operations may have additional requirements, so carriers should check the rules that apply to their operation.

Does DOT Require a Reflective Safety Vest?

A reflective safety vest is also not universally required as emergency equipment under 49 CFR § 393.95.

That does not make one a bad idea. A high-visibility vest can make a driver easier to see when standing outside the truck during a roadside breakdown, especially at night or in bad weather.

Carriers may also have their own safety policies, and separate requirements can apply depending on where a driver is working.

Are Spare Tires and Tire Tools Required Emergency Equipment?

Section 393.95 does not require every commercial motor vehicle to carry a spare tire or tire-changing tools as part of its federal emergency equipment.

Federal regulations do cover tire condition and safety. Drivers should inspect and maintain their truck tires to help prevent roadside failures.

What About Permit Books, Paper Logs, and Required Decals?

Emergency equipment is only one part of DOT compliance. Depending on the carrier and operation, drivers may need permits, registration documents, paper logs, or other records. Commercial vehicles are also subject to separate identification and marking rules, including requirements for displaying a USDOT number when applicable.

These are separate compliance topics. Permit books, paper logs, required decals, and other documents do not replace the emergency equipment required under 49 CFR § 393.95. Not every commercial vehicle is subject to the same paperwork requirements either.

Keeping these topics separate makes it easier to understand what equipment DOT actually requires for roadside emergencies.

DOT Emergency Equipment Checklist

For a typical covered truck or truck tractor, drivers and motor carriers should check for:

• A properly rated fire extinguisher.
• A fire extinguisher that is securely mounted and readily accessible.
• A way to visually determine whether the extinguisher is fully charged.
• Three compliant bidirectional reflective triangles or another option allowed under the current regulation.
• Spare fuses of each required type and size, if the spare-fuse requirement applies.
• Any additional equipment required for the vehicle, cargo, or operation.

Hazmat carriers should pay close attention to the higher fire extinguisher rating and restrictions on flame-producing warning devices.

Drivers also need to know how to use the equipment they carry. Having three reflective triangles in the truck will not help much if the driver does not know when or where federal rules require them to be placed.

Stay Compliant With DOT Emergency Equipment Requirements

Emergency equipment is a small part of running a compliant commercial motor vehicle, but it becomes especially important when something goes wrong on the road. Carriers should make sure each truck has the equipment required for its operation and that drivers know how to use it.

The key is knowing the difference between equipment required by federal regulation and gear that is simply smart to carry. Fire extinguishers, warning devices, and applicable spare fuses fall under the federal emergency equipment rules. First-aid kits, reflective safety vests, spare tires, and other roadside supplies can still be valuable, but they should not be treated as universal requirements under 49 CFR § 393.95.

Missing or improper emergency equipment can lead to violations during a DOT inspection and, depending on the violation, may contribute to an out-of-service condition. Checking this equipment before a problem happens is a simple way to protect both safety and compliance.

New motor carriers should also understand how vehicle and safety compliance are reviewed during a New Entrant Safety Audit.

Frequently Asked Questions