Figure 1 From Vehicle Group Based Crash Risk Formation And Propagation When traffic collisions occur on urban expressways, the consequences, including injuries, the loss of lives, and damage to properties, are more serious. however, the existing research on the severity of expressway traffic collisions has not been deeply explored. the purpose of this research was to investigate how various factors affect the severity of urban expressway collisions. the severity. 1. introduction. urban expressways have become an increasingly important component in urban road systems. compared with general urban roads, urban expressways have the characteristics of higher speed limits, dividers in the center of the road, the formation of three dimensional intersections adopted at the intersection of roads, high road linear design requirements, and prohibited pedestrians.
Figure 1 From Safety Analytics For Integrating Crash Frequency And Real For collisions involving pedestrians and non motorized vehicles, the risk of more severe injury was 7.508 times higher than that associated with vehicle vehicle collisions. the probability of more severe collisions on urban expressways with poor pavement conditions and wet surface conditions is greater than that on urban expressways with good. The results show that gender, collision modality, road pavement conditions, road surface conditions, and visibility are significant factors that affect the severity of urban expressway collisions. Survival analysis is a statistical analysis method that studies the relationship among duration, outcome and numerous influencing factors. the outcome in this paper corresponds to an expressway crash happening. the corresponding crash duration is the period from the normal driving state to the occurrence of the crash. In previous research on traffic flow and states, a three phase traffic flow theory is developed based on expressway data 11. the three phase traffic flow theory divided traffic states into three.
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