Safety vests are classified based on their visibility level and the specific risks they address, according to standards such as those from the American National Standards Institute (ANSI) and the International Safety Equipment Association (ISEA):

1. Class 1 Vests: Designed for low-risk environments with traffic speeds below 25 mph. These vests have minimal reflective material and are suitable for jobs like parking lot attendants and warehouse workers.
2. Class 2 Vests: Suitable for moderate-risk environments with traffic speeds up to 50 mph. They have more high-visibility and reflective material, making them ideal for construction workers, surveyors, and crossing guards.
3. Class 3 Vests: Intended for high-risk environments with traffic speeds exceeding 50 mph. These vests provide the maximum amount of reflective material, essential for highway workers, emergency responders, and tow truck operators.