Personal protective equipment requirements
Oregon DOT requires its employees to wear:
Hard hats – This is based on a hazard assessment, not day vs night. Soft caps are allowed when there is no overhead or electrical hazard.
Safety glasses – Based on a hazard assessment, not day vs night.
Safety shoes – Based on a hazard assessment, not day vs night. Bridge maintenance activities require safety-toed shoes.
Safety vests – ANSI Class II vests required for all flagging operations and night work. Bright colored clothing allowed for work during the day on or adjacent to the highway.
See the Personal Protective Equipment from ODOT Occupational Safety and Health Manual; also available at the given website.