Drivers’ Interaction with Adaptive Cruise Control on Dry and Snowy Roads with Various Tire-Road Grip Potentials

Table 2

Kinematic data of driving with ACC in both road conditions ().

Kinematic variable	Scenery and grip potential	Mean (M)	Standard deviation (SD)	95% confidence interval
				Lower limit	Upper limit
Speed set by the driver (m/s)	Summer ()	35.48	0.17	35.14	35.82
	Winter ()	32.55	0.30	31.97	33.14
Distance gap at begin of the ACC reaction (m)	Summer ()	179.78	1.80	176.20	183.35
	Winter ()	169.40	1.87	165.68	173.12
Mean deceleration of the ACC (m/s^2)	Summer ()	−0.84	0.01	−0.85	−0.82
	Winter ()	−0.72	0.01	−0.74	−0.70
Maximal jerk of the ACC deceleration (m/s^3)	Summer ()	11.14	0.45	10.25	12.03
	Winter ()	8.53	0.40	7.74	9.31
Mean acceleration of the ACC (m/s^2)	Summer ()	0.51	0.004	0.50	0.51
	Winter ()	0.48	0.01	0.47	0.49
Maximal jerk of the ACC acceleration (m/s^3)	Summer ()	5.30	0.26	4.78	5.82
	Winter ()	3.86	0.17	3.52	4.21
Distance gap after the ACC reaction (m)	Summer ()	34.38	0.16	34.07	34.69
	Winter ()	35.13	0.19	34.75	35.51

Note: m: meter; s: second.