Objective: This study examines the relationship between the Trails B total time T score to performance on the driving simulator in a normal young and older adult population. Method:. Participants included 28 older adults with an average age of 60 years (SD = 7.29) and 59 young adults with an average age of 20.14 years (SD =1.77). The data was derived from an on-going de-identified database of normal adults. They were administered Trails B and a driving simulator in which their driving errors were categorized and recorded. Results: A Pearson correlation was conducted between Trails B time with several types of driving errors. At p < .05, Trails B time was significantly correlated with Total Collisions for older adults (r = .631), but was non significant for younger adults. Total Lane Excursions for older adults yielded significant results (r = .501) and younger adults (r =. 379). Trails B time was not significantly correlated with Total Tickets/Violations in either population. Conclusion: Results revealed several significant positive relationships between Trails B total time and safe driving practices. In both populations, the significant correlations demonstrate moderate to strong relationships. However, solely the older adult sample demonstrated a strong relationship between Trails B total time and Total Collisions. Trails B is a measure of executive functions such as cognitive flexibility and set shifting. This demonstrates that successful driving is predicated on the ability to perform these functions. This indicates that as the normal aging process ensues, an individual's ability to perform these cognitive tasks are associated with dangerous driving outcomes. This is of primary concern with all populations, but particularly with an increasingly aging population. In terms of clinical implications, Trails B should be integrated into the neuropsychological component of driving evaluations.