Final answer:
EMTs must wear high-visibility vests meeting the Class 2 or 3 standards of ANSI/IESA 107-2004 for safety during auto accidents as per the CFR.
Step-by-step explanation:
The high-visibility vests that are to be worn by EMTs (Emergency Medical Technicians) working the scene of an auto accident must meet specific safety standards to ensure they are clearly visible in what can often be chaotic and hazardous environments. These standards are delineated in the Code of Federal Regulations (CFR), which references consensus standards for high-visibility clothing.
According to the Code of Federal Regulations, the appropriate standard for high-visibility vests for EMTs is Class 2 or 3 standards of ANSI/IESA 107-2004. The American National Standards Institute (ANSI) and the International Safety Equipment Association (ISEA) have developed this standard to provide guidelines on the design and use of high-visibility and reflective clothing. Class 2 standards are intended for work activities where greater visibility is necessary during inclement weather conditions and complex backgrounds are present, while Class 3 standards provide the highest level of visibility for workers with high task loads in areas with dangerous traffic or poor sight distances.