Driving anger is known to be associated with aggressive driving, which can lead to a higher probability of accidents. Since the Driving Anger Scale (DAS) was first introduced in the US, different versions of the scale have been used in many countries to measure anger evoked by different traffic situations. The first aim of this study was to test the validity and reliability of the UK-DAS in Iran. The second aim was to examine the relationship between demographic factors and the DAS factors found in Iran. A total of 409 questionnaires were completed by Iranian drivers, out of which, 205 were used for exploratory factor analysis and 204 were used for confirmatory factor analysis. The results revealed a reliable four-factor structure in Iran including 19 of the original 21 items from the UK-DAS. These four factors were interpreted as discourtesy, direct hostility, reckless driving and progress impeded. Further analyses showed that younger, compared to older, participants scored higher on driving anger evoked by other road users’ discourtesy and direct hostile behaviours. With the factor structure validated in Iran the DAS can now be used in further research, for example to examine how Iranian drivers express their anger in different traffic situations. Cross-culturally, the results can be compared with other countries.