Vehicle Driving Risk Prediction Based on Markov Chain Model

Table 5

Characteristics of TW-based driving risk state clusters.

(TW = 1.4 s)	Cluster group	C1 (low risk)	C2 (medium risk)	C3 (high risk)
Clustering variables	RL_avg	2.329	5.027	7.115
	RL_last	2.293	5.053	7.484
	CON	−0.054	−0.002	0.188
Observed parameters	iTTC_avg	−0.065	0.114	0.453
	iTTC_std	0.029	0.039	0.226
	THW_avg	2.471	1.254	0.666
	THW_std	0.239	0.059	0.067
	# of obs.	5587 (52.4%)	3064 (28.8%)	2000 (18.8%)