This $156,013 federal Project Grant awarded by the National Institute on Drug Abuse (CFDA 93.279 - Drug Use and Addiction Research Programs) to West Virginia University supports a 5-year research study investigating the effects of cannabidiol (CBD) on the driving performance, drowsiness, sedation, and cognitive function of healthy adults aged 18-30. The research strategy will involve a randomized, parallel-group, double-blind, sex-stratified, three-arm trial with 300 participants randomized to receive either 300 mg of CBD oil, 150 mg of CBD oil, or a placebo oil. After treatment and a 120-minute wait period, participants will complete a 40-minute driving simulation and re-take cognitive tests. The central hypothesis is that, relative to placebo, increasing doses of CBD will be associated with greater impairment in driving performance, as well as increased drowsiness, sedation, and cognitive decline, with greater impairment anticipated among male participants. This research aims to collect essential data on the potential unintended consequences of CBD use, which could inform policies and public safety messaging regarding CBD's impact on driving and collision risk.