Driver must be able to perceive a forced whisper in one ear at not less than 5 feet with or without the use of a hearing aid.
The Department of Transportation (DOT), Federal Motor Carrier Safety Administration (FMCSA) allows drivers operating commercial motor vehicles in interstate commerce to apply to the Agency for an exemption from the hearing standard at 49 CFR 391.41(b)(11) of the Federal Motor Carrier Safety Regulations.