This controlled 3-arm study with 95 participants showed that Posit Science visual brain training improved driving safety. During a post-training driving evaluation, it was observed that Posit-trained drivers traveling at 55 MPH stopped 22 feet sooner than drivers in the two control groups and performed fewer dangerous maneuvers overall. The improvement in driving safety persisted in an 18-month follow-up test. Control participants who trained on a traditional driving simulator only showed no improvement in driving safety.