Assessing the Effects of Interchange Warning Systems on Driving Risk: A Driving Simulator Study

Table 3

Classification scope of evaluation indicators.

Clustering category	B	C	A	E	D
Risk level	0	1	2	3	4
Speed	(0.642, 0.812]	(0.332, 0.488]	(0.488, 0.642]	(0, 0.332]	(0.812, 1]
Brake pedal depth	(0, 0.243]	(0.243, 0.455]	(0.455, 0.559]	(0.559, 0.791]	(0.791, 1]
Acceleration	(0, 0.107]	(0.532, 0.671]	(0.315, 0.532]	(0.107, 0.315]	(0.671, 1]
Heart rate	(0, 0.122]	(0.122, 0.284]	(0.284, 0.488]	(0.488, 0.728]	(0.728, 1]
Electrodermal activity	(0, 0.071]	(0.071, 0.188]	(0.188, 0.442]	(0.442, 0.749]	(0.749, 1]
Saccade velocity	(0, 0.063]	(0.063, 0.124]	(0.124, 0.378]	(0.378, 0.698]	(0.698, 1]
Saccade amplitude	(0.252, 0.352]	(0.352, 0.412]	(0.412, 0.548]	(0, 0.252]	(0.548, 1]