DOT Truck Safety Equipment Requirements: The Complete Checklist

Published: August 9, 2026 · By Anne Johnson

THE SHORT LIST: WHAT'S FEDERALLY REQUIRED

Under 49 CFR §393.95, every truck, truck tractor, and bus operating in interstate commerce has to carry two categories of emergency equipment, full stop:

• A fire extinguisher — rated 5 B:C or higher (or two rated 4 B:C or higher) for standard freight, and 10 B:C or higher for power units hauling a placarded amount of hazardous material.
• Warning devices for a stopped vehicle — three bidirectional reflective triangles meeting FMVSS 125. This is the current standard following FMCSA's 2026 rule changes, which removed the older references to liquid-burning flares from the regulation.

That's the entire federally mandated list for carried emergency equipment. Everything else on this page is either a state-level add-on or a strong best practice — and knowing which is which matters, because inspectors, auditors, and your own drivers all treat "required" differently depending on which bucket an item falls into.

WHERE THE CONFUSION COMES FROM

Three items get assumed as DOT requirements far more often than they're actually federally mandated:

• First aid kits. FMCSA does not require a first aid kit under Part 393 for general interstate trucking. Some states, some motor carrier safety programs, and virtually all NEMT and passenger-carrying contracts require one — but it's not a blanket federal rule the way the extinguisher and triangles are.
• Spare fuses. This was a real federal requirement under §393.95(b) for decades. FMCSA removed it effective April 20, 2026, reasoning that modern CMVs rarely lose function to a blown fuse the way older vehicles did.
• Tire chains. Not a federal requirement anywhere in Part 393. Several mountain-corridor states (California's Caltrans chain control, Colorado's traction law, among others) require them seasonally on specific routes — a state and route-specific rule, not a nationwide DOT one.

THE FULL CHECKLIST

For a fleet manager building a truck kit from scratch, this is the practical breakdown:

• Required everywhere, always: UL-rated fire extinguisher sized to cargo type, three FMVSS 125 reflective triangles.
• Required by route or cargo: tire chains on posted chain-control routes, higher-rated extinguisher for hazmat-placarded loads.
• Required by contract or state program: first aid kit (common in NEMT, school bus, and many state fleet contracts even where not federally mandated).
• Strongly recommended, not required: high-visibility vest for roadside work, flashlight, gloves, spill absorbent for minor fluid leaks.

WHY THIS DISTINCTION MATTERS AT INSPECTION

A roadside inspector checking emergency equipment compliance is checking against §393.95 specifically — extinguisher rating and warning devices. They are not going to cite a truck for missing a first aid kit or tire chains outside chain-control season. But a state auditor reviewing a NEMT contract, or a safety manager doing an internal audit against company policy, may hold the vehicle to a stricter internal standard. Knowing which rule you're being measured against up front avoids both under-equipping for compliance and over-spending on things nobody is actually requiring.

BUILDING OR AUDITING A KIT

For the fire extinguisher rating rules and mounting requirements in full detail, see our commercial vehicle fire extinguisher requirements guide. For exact triangle placement steps and timing, see our DOT triangle requirements guide. Browse DOT Truck Safety Kits built to current §393.95 requirements, or see our full DOT Compliant Safety Kits lineup.

FAQ

IS A FIRST AID KIT REQUIRED IN A DOT TRUCK?

Not under federal FMCSA rules for general interstate trucking. It may be required by your state, your company policy, or a specific contract (NEMT, school transport, etc.).

DO I STILL NEED SPARE FUSES IN MY TRUCK KIT?

No. FMCSA removed the spare fuse requirement from §393.95(b) effective April 20, 2026.

WHAT'S THE ONE THING EVERY COMMERCIAL TRUCK MUST CARRY BY FEDERAL LAW?

A correctly rated fire extinguisher and three reflective warning triangles — those are the two non-negotiable federal requirements under §393.95.