Quick Summary: High-visibility (hi-vis) safety apparel is designed to make workers more visible in environments where struck-by hazards exist. OSHA requires employers to protect workers exposed to vehicle traffic and heavy equipment, and ANSI/ISEA 107 establishes the performance standards for hi-vis apparel. This guide explains ANSI classes, garment types, job requirements, compliance rules, and when hi-vis apparel must be replaced.
Why High-Visibility Apparel Is Critical for Workplace Safety
Struck-by incidents involving vehicles and mobile equipment remain one of the leading causes of serious injuries and fatalities in construction, roadway, warehouse, and industrial environments. Reduced visibility due to low light, weather conditions, traffic speed, or congested work zones significantly increases risk.
High-visibility apparel improves worker conspicuity by using fluorescent background materials combined with retroreflective striping. This allows workers to be seen during daylight, low-light, and nighttime conditions.
OSHA Requirements for High-Visibility Apparel
OSHA does not publish a standalone hi-vis apparel standard. Instead, OSHA enforces visibility requirements through the General Duty Clause and specific industry regulations, including roadway construction and flagging operations. OSHA recognizes ANSI/ISEA 107 as the accepted consensus standard for high-visibility safety apparel.
Employers must conduct a hazard assessment to determine when hi-vis apparel is required and ensure garments meet ANSI performance criteria.
What Is ANSI/ISEA 107?
ANSI/ISEA 107 is the American National Standard for High-Visibility Safety Apparel. It defines design, color, retroreflectivity, and performance requirements for garments intended to improve worker visibility in hazardous environments.
The standard classifies garments based on the amount of visible material and the level of risk associated with the job task.
ANSI Class 1 High-Visibility Apparel
Class 1 garments provide the lowest level of visibility and are intended for environments with minimal traffic exposure.
Typical Class 1 Applications
- Parking lot attendants
- Warehouse workers separated from vehicle traffic
- Delivery drivers performing short-duration tasks
Class 1 apparel is not suitable for roadway work or high-speed traffic environments.
ANSI Class 2 High-Visibility Apparel
Class 2 garments offer increased visibility and are commonly used in environments where workers are exposed to traffic traveling at moderate speeds.
Typical Class 2 Applications
- Roadway construction crews
- Utility workers
- Surveyors
- Railroad workers
Class 2 vests, shirts, and jackets are the most commonly required hi-vis garments across public works projects.
ANSI Class 3 High-Visibility Apparel
Class 3 garments provide the highest level of visibility and are required in high-risk environments with fast-moving traffic or complex work zones.
Typical Class 3 Applications
- Highway construction
- Nighttime road work
- Emergency response operations
- Towing and recovery services
Class 3 garments feature full-sleeve coverage and maximum retroreflective material to ensure 360-degree visibility.
Types of High-Visibility Safety Apparel
Hi-vis apparel is available in multiple garment styles to match job requirements and weather conditions:
- Safety vests
- Hi-vis T-shirts and long-sleeve shirts
- Safety jackets and parkas
- Rainwear and waterproof apparel
- Hi-vis hoodies and sweatshirts
Fluorescent Colors and Retroreflective Striping
ANSI 107 specifies approved background colors, including fluorescent yellow-green, fluorescent orange-red, and fluorescent red. Retroreflective striping enhances nighttime visibility by reflecting light back toward its source.
When Hi-Vis Apparel Must Be Replaced
High-visibility garments must be replaced when they become faded, torn, heavily soiled, or when retroreflective striping loses effectiveness. Dirty or damaged apparel may no longer meet ANSI performance requirements.
Employer Responsibilities for Hi-Vis Compliance
Employers are responsible for selecting appropriate hi-vis apparel, training workers on proper use, and ensuring garments remain in serviceable condition.
People Also Ask
Is high-visibility clothing required by OSHA?
OSHA requires visibility protection when workers are exposed to traffic hazards.
What is ANSI Class 3 hi-vis?
Class 3 provides the highest level of visibility.
Can hi-vis vests be reused?
Yes, if they remain clean and undamaged.
What color hi-vis vest is required?
ANSI-approved fluorescent colors must be used.
Do warehouses require hi-vis apparel?
Yes, when mobile equipment is present.
Author
Mick Chan is a safety supplies industry professional with over 15 years of experience specializing in construction safety compliance, PPE regulations, and high-visibility apparel procurement across California.