High-Visibility Clothing
High-visibility (hi-vis) clothing is required when workers face struck-by hazards from moving vehicles or equipment. OSHA's general industry and construction standards reference ANSI/ISEA 107, which defines performance classes based on the visibility provided and the traffic hazard environment. The standard also covers retroreflective tape patterns that make workers visible at night under vehicle headlights.
ANSI/ISEA 107 Performance Classes
| Class | Background Material Area | Retroreflective Tape Area | Typical Use |
|---|---|---|---|
| Class 1 | 217 sq in minimum | 155 sq in minimum | Low traffic, slow speeds — parking lots, pedestrian areas, warehouse interiors with limited vehicle traffic |
| Class 2 | 775 sq in minimum | 201 sq in minimum | Higher traffic or speed, complex backgrounds — road maintenance near traffic, airport ramps, railway work |
| Class 3 | 1,240 sq in minimum | 310 sq in minimum | High speed or heavy traffic, reduced visibility conditions — highway work zones, emergency responders, flaggers on high-speed roads |
Class is not interchangeable — a worker wearing Class 1 in a Class 3 environment has less visibility than the hazard demands. The class is determined by the traffic environment, speed, and complexity of the visual background (a simple rural road is less visually complex than an active construction site with equipment, materials, and workers creating a cluttered background).
MUTCD Requirements for Road Work
Workers in or near public road rights-of-way are governed by the Manual on Uniform Traffic Control Devices (MUTCD), which specifies minimum ANSI 107 classes based on road type and speed:
- All workers in temporary traffic control zones on public roads must wear ANSI Class 2 or Class 3 garments as a minimum
- Flaggers directing traffic on roads with 50 mph+ speed limits generally require Class 3
- Emergency responders working in or near moving traffic require Class 2 minimum, Class 3 in high-speed environments
OSHA's construction standard (29 CFR 1926.201) requires that flaggers wear warning vests or similar garments meeting ANSI 107. The MUTCD's specific class requirements provide the practical implementation detail.
Type designations
ANSI 107 also uses Type designations that describe the garment form:
- Type O (Off-Road): Non-MUTCD applications — parking attendants, warehouse workers, etc.
- Type R (Roadway): Public road work environments — meets MUTCD requirements
- Type P (Public Safety): Emergency responders and law enforcement
For road work, specify Type R garments at the appropriate performance class. A Type O garment may meet the background and retroreflective material area requirements at Class 2 but may not have the configuration required for MUTCD compliance.
Color requirements
ANSI 107 permits fluorescent yellow-green, fluorescent orange-red, or fluorescent red as background colors. For road work, fluorescent orange-red is the standard — it's the color most associated with road workers and construction equipment and provides maximum contrast against natural backgrounds. Fluorescent yellow-green is used in some environments where orange conflicts with other signals (some railway applications).
Washing and degradation
Fluorescent dyes degrade with UV exposure and repeated washing. Retroreflective tape loses its reflectivity as the glass beads in the tape accumulate contamination or the tape delaminates. ANSI 107-compliant garments are rated for a minimum number of wash cycles — typically 25 industrial washes — before performance degrades below the standard. In practice, inspect garments regularly and replace when fluorescence appears faded or retroreflective tape shows cracking, peeling, or loss of reflectivity.
Safety Footwear
OSHA's foot protection standard (29 CFR 1910.136 for general industry, 29 CFR 1926.96 for construction) requires appropriate protective footwear when workers are exposed to foot injuries from falling or rolling objects, objects that could pierce the sole, and electrical hazards. The standard references ASTM F2413, which defines what "protective footwear" means in measurable terms.
ASTM F2413 Rating System
Safety footwear is marked with the ratings it has passed. The marking appears on a label inside the shoe or boot. Understanding the codes tells you what protection the footwear actually provides:
| Code | Meaning | Test Requirement |
|---|---|---|
| ASTM F2413 | Base standard — the shoe meets the standard's general requirements | — |
| I/75 | Impact protection — toe box | Withstands 75 ft-lbs of impact (steel, composite, or aluminum toe) |
| C/75 | Compression protection — toe box | Withstands 2,500 lbs of compression |
| Mt/75 | Metatarsal protection | Protects the metatarsal bones (top of foot, behind the toes) |
| PR | Puncture resistant sole | Sole resists penetration from a 60-penny nail under 270 lb force |
| EH | Electrical hazard — secondary protection | Sole and heel resist 18,000 V at 60 Hz for 1 minute with no current flow exceeding 1 mA |
| SD | Static dissipative | Dissipates electrostatic charge — opposite of EH, used in environments where static must be controlled |
| CD | Conductive | Maximally conductive — for explosive environments where static is a detonation hazard; requires special handling |
| CR | Chain saw resistant | Forestry applications |
I/75 C/75 is the standard combination for impact and compression protection — what most people mean by "safety toe." The toe box material (steel, composite, or aluminum) doesn't change the rating, only the physical properties of the toe cap itself. Steel toes are heavier but don't flex under extreme compression. Composite toes are lighter and non-conductive (relevant for electrical work). Aluminum toes are lighter than steel with similar compression resistance but are conductive.
Selecting by hazard
The PPE hazard assessment should specify which ASTM ratings are required for each job classification based on the actual hazards present:
- Falling objects (construction, warehousing, manufacturing): I/75 C/75 at minimum. Metatarsal protection (Mt/75) for workers handling heavy materials that could land on the top of the foot, or operating heavy equipment.
- Puncture hazards (roofing, demolition, construction): PR-rated sole in addition to toe protection. Standard safety toe shoes without PR soles don't protect against stepping on nails or sharp debris.
- Electrical work: EH-rated footwear provides secondary protection against accidental contact with energized circuits. EH shoes are not a substitute for proper LOTO or safe work practices — they're a last line of defense. Note that SD (static dissipative) and EH are incompatible ratings; footwear can have one or the other, not both.
- Slip hazards (food service, healthcare, housekeeping): Slip-resistant outsoles are not a separate ASTM rating category but are specified by many employers for wet environments. Look for outsole materials and tread patterns designed for the specific floor surface — a sole rated for wet tile may not perform well on greasy concrete.
Who pays for safety footwear
OSHA's PPE payment rule (29 CFR 1910.132(h)) includes a specific exception for safety footwear. Employers are not required to pay for non-specialty safety-toe footwear if the employer permits workers to wear the footwear off the jobsite. Most standard safety boots qualify as non-specialty — they're work boots that employees would wear in other contexts. Specialty footwear that can only reasonably be used for the specific work application (e.g., rubber boots for hazardous chemical environments, metatarsal guard boots) must be provided at employer expense.
This exception is frequently misunderstood. "Non-specialty" doesn't mean the employer can never pay — it means the employer is not required to. Many employers choose to provide an annual footwear allowance or reimbursement regardless, which reduces disputes about what qualifies as non-specialty and improves compliance with footwear requirements.
Inspection and replacement
Safety footwear should be inspected regularly for sole separation, cracked toe caps, worn-through outsole tread, and damage to the upper. EH-rated footwear loses its electrical hazard protection when the sole is wet, punctured, or contaminated with conductive materials — workers in electrical environments should inspect their footwear at the start of each shift. Steel toe caps that have been subjected to a crushing impact should be replaced even without visible deformation — the cap may have yielded internally.