Identification of Accident Blackspots on Rural Roads Using Grid Clustering and Principal Component Clustering

Table 8

		Accident black spots	Nonaccident black spots	Total proportion
Main reason	Other reasons (road users have no obvious fault) R1	0.615	0.455	0.533
	Turning vehicles do not allow straight-through vehicles and pedestrians R2	0.173	0.145	0.159
	Nonmotorized vehicles violate traffic rules R3	0.096	0.109	0.103
Total		0.885	0.709	0.794