OSHA Safety Vest Requirements: Who Needs Hi-Vis and Which Class

OSHA does not have a single rule requiring every worker to wear a hi-vis safety vest. It requires high-visibility garments in specific cases, chiefly flaggers and excavation crews exposed to public traffic, and it expects employers to require them anywhere the PPE hazard assessment shows workers need to be seen.

On public roads a second rulebook sets the class. The Manual on Uniform Traffic Control Devices (MUTCD) requires Class 2 or Class 3 apparel for workers within the right-of-way who are inside a temporary traffic control zone. Most questions about OSHA safety vest requirements come down to which of those two systems governs the work in front of you.

Does OSHA require hi-vis vests?

In a few situations, by name. Everywhere else, through the employer's duty to assess hazards and pick the PPE that addresses them. Four pieces of OSHA's rules do the work.

Flaggers on construction projects: 29 CFR 1926.201(a)

OSHA's construction rules require flaggers' warning garments to conform to Part 6 of the MUTCD (29 CFR 1926.201(a)). OSHA doesn't write its own garment spec here. It borrows the traffic manual's.

There's a wrinkle. OSHA's incorporation-by-reference section for construction, 29 CFR 1926.6, still points to the 2009 edition of the MUTCD, not the current 11th Edition. For a buyer, the practical move is to spec garments to the current edition's language: ANSI/ISEA 107 Class 2 or Class 3.

Excavations exposed to traffic: 29 CFR 1926.651(d)

Employees exposed to public vehicular traffic during excavation work must wear "warning vests or other suitable garments marked with or made of reflectorized or high-visibility material" (29 CFR 1926.651(d)). The rule names no class. If the dig sits inside a road work zone, the MUTCD's Class 2 or Class 3 requirement applies on top of it.

Everyone else: the PPE hazard assessment

Outside those named cases, hi-vis comes in through 29 CFR 1910.132(d), which requires employers to assess the workplace for hazards and select PPE that protects against them. Construction has parallel language at 1926.28 and 1926.95. When the assessment finds that people on foot can be struck by vehicles or moving equipment, hi-vis is one of the controls, and the employer sets the requirement.

The General Duty Clause

OSHA has also used the General Duty Clause for highway work zone hazards, as discussed in an OSHA interpretation letter dated August 5, 2009. The practical reading: the absence of a vest-specific rule for your task does not mean the absence of an obligation.

What the MUTCD requires in road work zones

Section 6C.05 of the MUTCD 11th Edition (current with Revision 1, December 2025) is the closest thing to a national hi-vis rule for road work. Its main points:

• All workers within the right-of-way who are inside the temporary traffic control zone, emergency responders included, shall wear apparel meeting Performance Class 2 or 3 of ANSI/ISEA 107-2015 "or equivalent revisions." Garments rated to ANSI/ISEA 107-2020 fall under that wording.
• A person designated by the employer to be responsible for worker safety shall select the appropriate class.
• Background material shall be fluorescent orange-red, fluorescent yellow-green, or a combination of the two.
• For flaggers working at night, apparel meeting Class 3 should be worn. That's guidance, a "should" rather than a "shall," so check your contract: a project owner can make it mandatory.
• Emergency and incident responders and law enforcement have the option of apparel labeled ANSI/ISEA 207-2006 instead.

The MUTCD's reach on this used to be narrower. A separate federal rule, 23 CFR 634, covered workers on Federal-aid highways. FHWA removed Part 634 in its 2009 MUTCD final rule, effective January 15, 2010, and moved the worker visibility requirement into the MUTCD so it applies on all public roads. You'll still see 23 CFR 634 cited in older training material. It no longer exists.

Kiwi's road and highway gear is built around those two classes. Every rated Kiwi garment is Type R, Class 2 or Class 3.

Which rule applies, and what class it calls for

Do warehouse workers need to wear safety vests?

Not under any OSHA rule written for vests. Warehouse hi-vis comes from the hazard assessment. When people on foot share aisles, docks or yards with forklifts, tuggers or trucks, the assessment is likely to point to hi-vis. Once the employer requires it, it's mandatory on that site.

OSHA sets no class for this work, and the MUTCD doesn't apply off the road. ANSI/ISEA 107 allows Class 1 for off-road (Type O) garments, but Kiwi doesn't make Class 1. Class 2 sets a far higher floor than Class 1: 775 square inches of background against 217. Our Class 2 vests, shirts and polos are built to that class. Before settling on a class, ask whether the shift ever takes anyone into the truck yard or out to the street. If it does, buy for that.

For low-risk indoor areas where no class is required, the black reflector safety vest adds retroreflective tape without fluorescent background. It's reflectors only, not a rated class, so keep it out of anywhere a class is required. The warehouse and logistics collection pulls together gear for dock and floor work.

The 25 mph and 50 mph rule of thumb

Many agencies and safety managers still use a speed-based shortcut: Class 2 where traffic moves faster than 25 mph, Class 3 where it moves faster than 50 mph or the work happens at night. It's a reasonable starting point, and it's the recommendation we give crews who ask where to begin.

It isn't in the current standard. The speed bands come from the first edition, ANSI/ISEA 107-1999. The 2004 revision removed speed-based selection, and neither the 2015 nor the 2020 edition has speed cutoffs. Today the standard leaves the choice to a hazard assessment that weighs traffic speed and volume, separation from traffic, background complexity, task load and light conditions.

The shortcut also has a gap at the low end. Under the current MUTCD, a 20 mph residential street still calls for Class 2 inside a work zone. Treat the bands as a way to decide when to move up to Class 3, never as permission to drop below Class 2 on a road. Our guide to which hi-vis class your crew needs covers the material minimums behind each class.

Hazard assessment questions for hi-vis

Print these for the site file.

• Does anyone work inside a public road right-of-way or a temporary traffic control zone?
• Does anyone flag traffic after dark?
• Is there an excavation exposed to public vehicular traffic?
• Do people on foot share space with forklifts, trucks or heavy equipment?
• How fast and how heavy is the traffic, and how much separation is there?
• Is the background busy with signs, lights, equipment or other workers?
• Does the work run at dawn, dusk, at night, or in rain and fog?
• Has the DOT, project owner or general contractor named a class in the contract?
• Who is the designated person selecting the class, and is that decision on record?

Nothing here is legal advice. Rules are applied to specific facts, so confirm the requirement against your own hazard assessment, your state plan if you operate under one, and the contract documents.

Frequently asked questions

Does OSHA require Class 2 or Class 3 safety vests?

OSHA's general PPE rules don't name a class. For flaggers on construction projects, 29 CFR 1926.201(a) points to the MUTCD, and the MUTCD requires Class 2 or Class 3 for workers in temporary traffic control zones. Off the road, the employer's hazard assessment sets the class.

Is a safety vest required on a construction site?

OSHA requires hi-vis for flaggers and for excavation workers exposed to public traffic. Beyond those cases, it depends on the employer's hazard assessment. A general contractor's site rules can also require hi-vis for everyone on foot.

What color safety vest does OSHA require?

OSHA doesn't set a color. For road work, the MUTCD requires fluorescent orange-red, fluorescent yellow-green, or a combination. ANSI/ISEA 107-2020 also recognizes fluorescent red, but that isn't one of the MUTCD's roadway options. Our post on hi-vis yellow vs orange covers how to choose between the two.

Does a hi-vis shirt count instead of a vest?

Yes, if it's rated. The MUTCD calls for apparel meeting Class 2 or Class 3, not a vest specifically. A shirt labeled Type R Class 2 or Class 3 qualifies; a background-material-only shirt or hoodie does not, because it has no retroreflective tape and isn't a rated class.

Outfitting a road crew or a public works fleet

Send the classes, styles and sizes your assessment calls for through our quote request form and we'll price the whole order. Agencies and contractors that want their name on the gear can add it through custom logo bulk orders, printed clear of the reflective tape and sized so the garment still meets the background minimum for its class.