federal legal definition safety-sensitive function
â 7 â. Safety-sensitive function means all time from the time a driver. begins to work or is required to be in readiness to work until the. time he or she is relieved from work and all responsibilities for. performing work. Safety-sensitive functions include: â  All time at an employer or shipper plant, terminal, facil-.
(a) Except as provided in subpart F of this part, no driver shall perform safety-sensitive functions, including driving a commercial motor vehicle, if the driver has engaged in conduct prohibited by subpart B of this part or an alcohol or controlled substances rule of another DOT agency.