The value of self report measures as indicators of driving behaviors among young drivers
Although much of the knowledge in transportation psychology has been gained by means of self report measures, there is still a dispute regarding the usefulness and validity of such instruments. This series of two studies employed multivariate statistical models to examine associations between self report and objective measures in two samples of young drivers. Study 1 (n=151) compared scores on the Multidimensional Driving Style Inventory (MDSI) a self report questionnaire tapping four broad driving styles, with the naturalistic driving recorded by an in vehicle data recorder (IVDR) Study 2 (n=80) compared responses to the Reckless Driving Habits Scale, assessing the frequency with which drivers commit a set of risky behaviors, with driving measures collected by a simulator. This study also examined the personality trait of sensation seeking, as well as gender and driving experience. In Study 1, the analysis revealed positive associations between high scores on the risky and hostile driving styles measured by the MDSI and risky behaviors measured by the IVDR, as well as inverse correlations between the latter and high MDSI scores on the anxious and careful driving styles. Similarly, in Study 2 associations were found between the self reported frequency of reckless driving habits and several risky behaviors measured by the driving simulator. In addition, risky behaviors correlated with the sociodemographic variables and sensation seeking. The two studies, therefore, show that self report measures are reliable tools for assessing driving behaviors for purposes of research, evaluation, and intervention.