Spatial distribution of traffic accident density at urban road intersection considering severity
1. School of Traffic and Transportation， Northeast Forestry University， Harbin， Heilongjiang 150040， China； 2. China Design Group Co., Ltd., Nanjing, Jiangsu 210014， China
Abstract：To explore the spatial distribution patterns of traffic accidents at urban road intersections and find out the key factors affecting the severity of accidents, 1 758 valid intersection accident samples and 9 categories features were extracted from the traffic accident database of Harbin. The spatial distribution of intersection accidents was visualized，and the density analysis algorithm was used to obtain the spatial distribution characteristics of intersection accidents considering the road network density, intersection density and severity respectively. The accident severity was divided into fatal accidents and non-fatal accidents. The random forest was used to rank the significant factors affecting the accident severity in the whole urban area, low density area and medium-high density area. The results show that the spatial distribution of intersection accidents differs considering road network density, intersection density and severity respectively. Season and weather are the significant factors for the whole urban, low density and medium-high density area, while intersection type, accident type and time of day are the respectively significant factors for the three types of areas.
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2023, Vol. 44 
