Deffenbacher Driving Anger Scale.
The Deffenbacher Driving Anger Scale is a 14 item questionnaire.
Items are scored on a 1-5 scale, with the total scale score calculated as a sum of the items.
Deffenbacher, J.L., Oetting, E.R., & Lynch, R.S. (1994). Development of a Driving Anger Scale. Psychological Reports, 74, 83-91.