Analyzing the Safety Impacts of Variable Speed Limit Control on Aggregated Driving Behavior Based on Traffic Big Data

Table 1

Number of samples within different density intervals under different speed limits (“—” means the sample size is less than 15).

Lane	Density (veh/km)	Number of samples under different speed limits (km/h)
		No VSL	120 km/h	100 km/h	80 km/h	60 km/h	50 km/h
Left lane	0–5	217	28	18	—	—	—
	5–10	621	147	83	—	—	—
	10–15	496	178	103	18	—	—
	15–20	317	395	94	30	16	—
	20–25	221	687	54	48	45	15
	25–30	101	315	19	—	—	—
Middle lane	5–10	97	21	—	—	—	—
	10–15	476	194	79	—	—	—
	15–20	1020	804	219	60	15	—
	20–25	345	637	66	18	30	16
	25–30	50	119	—	—	—	—
Right lane	5–10	325	175	31	—	—	—
	10–15	1220	875	242	49	—	—
	15–20	412	626	99	31	38	15
	20–25	37	91	—	—	—	—