The Federal Motor Carrier Safety Administration (FMCSA) and Federal Railroad Administration (FRA) request data and information concerning the prevalence of moderate-to-severe obstructive sleep apnea (OSA) among individuals occupying safety sensitive positions in highway and rail transportation, and on its potential consequences for the safety of rail and highway transportation. FMCSA and FRA (collectively “the Agencies”) also request information on potential costs and benefits from regulatory actions that address the safety risks associated with motor carrier and rail transportation workers in safety sensitive positions who have OSA. For instance, the agencies request comment on the costs and benefits of requiring motor carrier and rail transportation workers in safety sensitive positions who exhibit multiple risk factors for OSA to undergo evaluation and treatment by a healthcare professional with expertise in sleep disorders.