According to US DOT regulations, what must all personnel at roadway incidents wear?

High-visibility vests are a crucial part of personal protective equipment for personnel working at roadway incidents, as mandated by US Department of Transportation regulations. Their primary purpose is to enhance visibility of workers, especially in environments where vehicles may be present. High-vis vests are designed with bright colors and reflective strips, making it easier for drivers to see personnel from a distance, thus reducing the risk of accidents.

In contrast, while hard hats, safety goggles, and reflective gloves serve important safety roles in various situations, they are not universally required for all personnel at roadway incidents. Hard hats protect against falling objects, safety goggles shield eyes from debris or chemicals, and reflective gloves improve visibility and grip but do not provide the same level of visibility as high-vis vests. Hence, high-vis vests are the standard requirement for ensuring safety at roadway incidents.