“…The tools used in this study were adapted from different published articles ( 27–29 , 32 , 34 , 40 ) and modified to make them suitable for the study context. These tools comprise a structured and open-ended questionnaire that includes the following variables: demographic characteristics [sex, age, educational and marital status, monthly income, family size, employee condition, driving license level, the experience of the driver, and possession of a car]; risky personal behaviors [alcohol use, chewing khat, cigarette smoking, prior punishment by traffic police, and the habit of checking vehicles]; driver factors [working hours per day, information sources about traffic safety (media, training, and friends vs. traffic police), traffic-related safety training, use of a safety belt]; vehicle conditions [vehicle type, service years of a vehicle, maintenance condition, and mechanical problems encountered], and environmental conditions [weather conditions like rain, windy, fog or cloudy; road type (non-asphalted vs. asphalted); time (day, afternoon, night, and midnight), and type of collision].…”