Study on the Influence of Connected Vehicle Fog Warning Systems on Driving Behavior and Safety

Table 3

Statistical analysis of index under fog zone.

Zone	Levels	Speed (km/h)			Lateral deviation (m)
		Mean (SD)	value	Difference between groups, value	Mean (SD)	value	Difference between groups, value
Whole zone (A–H)	Normal①	88.854 (19.571)	≤ 0.001	① − ②,  ≤ 0.001; ① − ③,  ≤ 0.001; ② − ③,  = 0.850	1.741 (0.127)	= 0.016	① − ②,  = 0.245; ① − ③,  = 0.004; ② − ③,  = 0.089
	HMI②	82.068 (17.443)			1.729 (0.094)
	HMI&DMS③	82.393 (18.010)			1.711 (0.093)
Clear zone (A–F)	Normal①	106.421 (9.588)	≤ 0.001	① − ②,  ≤ 0.001; ① − ③,  ≤ 0.001; ② − ③,  = 0.018	1.711 (0.159)	= 0.107	① − ②,  = 0.960; ① − ③,  = 0.071; ② − ③,  = 0.064
	HMI②	100.592 (0.894)			1.711 (0.081)
	HMI&DMS③	98.481 (2.752)			1.683 (0.116)
Transition zone (F–G)	Normal①	107.230 (9.159)	≤ 0.001	① − ②,  ≤ 0.001; ① − ③,  ≤ 0.001; ② − ③,  = 0.345	1.769 (0.048)	≤ 0.001	① − ②,  ≤ 0.001; ① − ③,  ≤ 0.001; ② − ③,  = 0.271
	HMI②	92.157 (6.710)			1.675(0.109)
	HMI&DMS③	94.319 (7.586)			1.651 (0.066)
Dense fog zone (G–H	Normal①	70.433 (4.346)	≤ 0.001	① − ②,  ≤ 0.001; ① − ③,  ≤ 0.001; ② − ③,  ≤ 0.001	1.777 (0.064)	= 0.955	① − ②,  = 0.762; ① − ③,  = 0.859; ② − ③,  = 0.901
	HMI②	64.767 (2.527)			1.774 (0.091)
	HMI&DMS③	66.643 (4.204)			1.775 (0.069)

Significant values at 95% confidence level.