The American National Standard for High-Visibility Safety Apparel, ANSI/ISEA 107-1999

This standard focuses on the many workers that are regularly faced with the hazards of low visibility while on the job. Three conspicuity classes of garments have been defined by the standard, each based on the wearer's activities and working environment. See abbreviated definitions below.

Class 1 - Environments where traffic does not exceed 25 mph, worker has full attention to approaching traffic, environment is less complex.
Class 2 - Inclement weather conditions require greater visibility, complex background is present, worker's attention is diverted from approaching traffic and performs tasks near vehicle exceeding 25 mph
Class 3 - High task loads are performed where traffic exceeds 50 mph, and worker must be easily identifiable as a person throughout a full range of body motions

CLASS 1 GARMETS are intended for use in activities that permit the wearer's full and undivided attention to approaching traffic. There should be ample separation of the worker from traffic, which should be travelling no faster than 25 miles per hour Examples of workers who use Class 1 apparel:
  • Parking lot attendants
  • People retrieving shopping carts from parking lots
  • Workers exposed to warehouse equipment traffic
  • Roadside "right of way" or sidewalk maintenance workers
CLASS 2 GARMENTS are intended for use in activities where greater visibility is necessary during inclement weather conditions or in work environments with risks that exceed those for Class 1. Garments in this class also cover workers who perform tasks that divert their attention form approaching traffic, or that put in close proximity to passing vehicles traveling at 25 miles per hour or higher. Examples of workers who use Class 2 apparel:
  • Forestry operations
  • Ship cargo-loading operations
  • Roadway construction, utility and railway workers
  • Survey crews
  • School crossing guards
  • High-volume parking and/or toll gate personnel
  • Airport baggage handlers/ground crew
  • Emergency response and law enforcement personnel
  • Trash collection and recycling operations
  • Accident site investigators
  • Railroad inspection and maintenance crews
CLASS 3 GARMENTS provide the highest level of visibility, and are intended for workers who face serious hazards and often have high task loads that require attention away from their work. Garments for these workers should provide enhanced visibility to more of the body such as the arms and legs Examples of workers who use Class 3 apparel:
  • Roadway construction personnel and flaggers
  • Utility workers
  • Survey crews
  • Emergency response personnel

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