One of the types of crashes that has a high fatality rate is the Hazardous Material (HAZMAT) truck-involved crashes. Investigating the factors affecting the severity of HAZMAT truck-involved crashes can assist authorities in making more accurate evaluations of policies to increase road safety and reduce the injury severity of crashes involving these vehicles. In this study, the main goal is to investigate the factors that affect the severity of HAZMAT truck-involved crashes. Considering the heterogeneity of the injury severity of crashes can provide a more accurate assessment of the factors involved in those crashes. In this regard, by using the data of 482 HAZMAT truck-involved crashes in Iran and also by using a Random Parameter Ordered Logit (RPOL) model, the factors affecting the injury severity of those vehicle crashes and systematic and random heterogeneity have been investigated. According to the results of the model, crashes with multiple vehicles involved have a significant effect on the increasing the severity of HAZMAT truck-involved crashes. Furthermore, the presence of public vehicles in HAZMAT truck-involved crashes, and the driver's risk-taking in driving at high speed based on driving records has a significant effect on the decreasing severity of crashes. In addition, the results showed that there is an interaction effect between the variables of vehicle age and upside-down crashes on increasing the injury severity of the crashes. On the other hand, the results indicate that there is an interaction effect between the variables of front-to-front, front-to-back, and low heavy truck traffic on the road with the variable of the crash caused by HAZMAT truck on increasing the injury severity of the crashes. The results of the study confirm that there is random heterogeneity based on the normal distribution function for the mean of injury severity of HAZMAT truck-involved crashes.
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