An Improved Car-Following Speed Model considering Speed of the Lead Vehicle, Vehicle Spacing, and Driver’s Sensitivity to Them

Table 1

Summary statistics of vehicle trajectory data for calibrating the proposed model.

Data items	Indicator
	Min	1^st quartile	Median	Mean	3^rd quartile	Max
Vehicle_ID	1	506	934	1,024	1,426	2,783
Vehicle_Class	1	2	2	2	2	3
Frame_ID	5	2,474	4,021	4,100	5,746	8,906
Total_Frames	160	531	718	728	911	1,328
Lane_ID	1	2	3	3	4	6
Leading_ID	0	450	882	976	1,390	3,109
Lagging_ID	0	465	901	991	1,408	3,109
Spacing (m)	0.00	13.29	18.43	20.78	25.64	237.05
Speed (m/s)	0.00	6.11	9.75	9.43	12.32	29.05
Acceleration (m/s^2)	−3.41	−0.26	0.00	0.05	0.44	3.41