Reliability of the Driving Behaviour Inventory

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Abstract
The Driving Behaviour Inventory (DBI), developed as a measure of dimensions of driver stress, was completed by 61 participants on two occasions separated by an interval of 5 months. Coefficients alpha, test-retest realiability, and correlational analyses between the five scales derived from earlier factor analyses revealed that the ‘driving aggression’, ‘dislike of driving’, ‘irritation when overtaken’ and ‘frustration in overtaking’ scales were reliable. The ‘general driver stress’ scale, derived from the single factor solution, was found to be particularly robust. In its original form the ‘driving alertness’ scale was found to be less robust. Minor changes in respect of adding items to and deleting items from three of the scales improved their reliability. It is concluded that overall the DBI is a reliable self-report measure of driver stress.