Determination of the Validity and Reliability of Bus Driver's Behaviour Questionnaire in Tehran in 2012: Exploratory and Confirmatory Factor Analysis

Most accidents can be directly attributed to human factors. The aim of this study is to determine the validity and reliability of drivers aberrant behavior questionnaire in urban Bus Company. This descriptive study was performed on 168 subjects (in order to exploratory factor analysis) and 161 subjects (for the sake of confirmatory factor analysis) from bus drivers in Tehran city. In this study, method of random and stratified sampling were used for selection of drivers and the samples were selected based on the number of items on the questionnaire. In the present study, the items of aberrant driver's behavior questionnaire obtained based on Persian version of unsafe behavior questionnaire of public drivers. For determination of the questionnaire factors and the confirmation exploratory factor analysis (with extraction method of principal axis factoring analysis and Varimax rotation) and confirmatory factor analysis were used, respectively. For the exploratory factor analysis, Kaiser-Meyer-Olkin and Bartlett tests and extraction factors and for the confirmatory factor analysis standard loads, t-values and fit model were used. The results of the exploratory factor analysis (EFA) excluded four factors: risky violation, slip and lapse, highway violation and mistakes. The findings of the confirmatory factor analysis (CFA) confirmed a significant relationship between the manifest variables (questions) and latent elements (factors) and showed that structures have an acceptable fit in the samples. Aberrant driver's behavior questionnaire among bus drivers has suitable validity and reliability. Therefore, using this tool is support and reliable in the future research.