The need to be seen is a critical issue for worker safety, especially for workers who perform tasks on or near moving vehicles or equipment. Wearing high visibility garments draws attention to workers & helps prevent injuries and fatalities from struck by hazards The American National Standard for High-Visibility Safety Apparel and Headwear (ANSI/ISEA 107-2015) is a standard established by American National Standards Institute, Inc. (ANSI) and the International Safety Equipment Association (ISEA). Construction, utility, police, emergency medical services, fire fighters, road workers, flaggers and airport ramp workers are routinely exposed to the hazards of low visibility while on the job. This standard provides guidelines for the selection and use of high-visibility safety vests to improve worker visibility during the day , in low-light conditions, and at night. ANSI / ISEA 107-2015 guidelines are divided into Multiple Types (O, R, P, and Supplemental) as well as 4 Classes (1, 2, 3 and E ) according to the level of risk present depending on working environment. Type O: Class 1 Class 1 provides the minimum amount of high-visibility materials required to differentiate the wearer visually from non-complex work environments where struck-by hazards will not be approaching at roadway speeds. Class 2 provides for the use of additional amounts of high-visibility materials, which may allow design opportunities to define the human form more effectively. Class 3 can offer greater visibility to the wearer in both complex backgrounds and through a full range of body movements by mandatory placement of background, retroreflective and combined-performance materials on sleeves and pant legs (if present). Regardless of the area of materials used, a sleeveless garment or vest alone shall not be considered Performance Class 3. TYPE P: Class 2 & 3 Type P provides daytime and nighttime visual conspicuity enhancement for emergency and incident responders and law enforcement personnel in occupational environments which include exposure to traffic (vehicles using the highway for purposes of travel) from public access highway right-of-ways, or roadway temporary traffic control (TTC) zones, or from work vehicles and construction equipment within a roadway temporary traffic control (TTC) zone or from equipment and vehicles within the activity area. Type P HVSA provides additional options for emergency responders, incident responders and law enforcement who have competing hazards or require access to special equipment.