https://doi.org/10.21949/15029002016PDFTech ReportRRA-16-019bCommercial driversHuman factors in crashesTraffic safetyHighway safetyDriver performanceExemptionMedical exemptionsUnited StatesUnited States. Department of Transportation. Federal Motor Carrier Safety AdministrationUnited States. Department of Transportation. Federal Motor Carrier Safety AdministrationUnited States Federal Motor Carrier Safety AdministrationFor commercial motor vehicle (CMV) drivers, safety performance depends not only on the condition of the vehicle being driven but also on the driver\u2019s ability to operate it. Because factors such as stopping time and distance, blind spots, and limited maneuverability pose greater challenges for the driver of a large truck o...