Driving anger and how people express it has been commonly measured through their physical and verbal aggression, aggressive use of their vehicle, and other behavioural traits and reactions.

This study delves deeper into the issue by analysing other differences, such as impulsiveness and narcissism, in relation to driving anger. These are measured according to the Driver Anger Scale (DAS).

Combining data from 48 different studies, the results reveal impulsiveness, normlessness and narcissism to have stronger associations with road rage, as compared to the Big Five personality traits. Road rage also proved to have strong connections with the nature of anger expressions, and atypical driving behaviour traits (such as errors and violations).