How was the Driver Risk Index™ developed?

Research on the development of the Driver Risk Index™ in the late 1980’s began with a large sample of drivers completing a driving diary over a period of days recording their driving experiences and responses. From this information, a questionnaire was developed and administered to hundreds of drivers. Responses to this questionnaire were subject to various statistical procedures to describe behavioural and emotional responses to driving. These statistical procedures resulted in the development of several behavioural scales to describe personality-based emotions and behaviours when driving. These scales were then assessed for reliability and validity and the findings published in a large number of published academic papers.