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

Table 5

	Cause sequence	Clustering center
		FREQ	CDR	EQUIV
Main factors	Turning vehicles do not allow straight-through vehicles and pedestrians	32.21	0.06	12.39
	Nonmotorized vehicles violate traffic rules
Minor factors	Deliberately impeding the safe driving behavior of others	7.5	0.21	5.74
Inducing factors	The sidewalk does not allow parking	8.28	0.13	3.82
Hidden factors	Illegal reversing	2.04	0.46	1.21
	Violating traffic lights
	Violating the marking line
	Unsafe travel distance
Negligible factors	Illegal reversing	3.54	0.003	1.25
	Reverse driving