A cluster analysis of responses from more than 1500 college students to 53 potentially angering driving-related situations yielded a 33-item driving anger scale (alpha reliability = .90) with six reliable subscales involving hostile gestures, illegal driving, police presence, slow driving, discourtesy, and traffic obstructions. Subscales all correlated positively, suggesting a general dimension of driving anger as well as anger related to specific driving-related situations. Men were more angered by police presence and slow driving whereas women were more angered by illegal behavior and traffic obstructions, but differences compensated so there were no gender differences on total score. A 14-item short form (alpha reliability = .80) was developed from scores more highly correlated (r = .95) with scores on the long form. Driving anger may have potential value for research on accident prevention and health psychology.