THE MODELS OF ACCIDENT SIZE COMPARISONS BETWEEN INTERCITY MOTORWAY ROUTES
Keywords:
Intercity motorway, accident size, structural equation modeling, measurement invariance, ThailandAbstract
Intercity motorways in Thailand play an important role in national development, as they link various industrial zones and main harbors for transporting goods abroad. Furthermore, they connect national tourist attractions. When considering the trend of accident occurrences on motorways, it has been found that the severity of accident trend has leaned forwards to be on the continuous increase. This research attempts to establish guidelines for reducing the severity of accidents on motorways number 7 and number 9 in Thailand; thus, the differences between the two motorways were considered. This research used and analyzed data from 2010 to 2016 from the Intercity Motorway Division, Department of Highways. As the severity of injuries cannot be directly measured, the number of minor injuries, serious injuries, and deaths, as well as the number of vehicles involved in each accident, were chosen for analysis using structural equation modeling (SEM). Subsequently, a multiple group analysis was used to analyze the differences between the two models. The results of the factor analysis revealed significantly different severities of injuries. For motorway number 7, the traffic flow factor mostly affected accident size, followed by the road factor and the environmental factor, respectively. For motorway number 9, only surrounding and road factors affected accident size.
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