Driver Behavior on Combination of Vertical and Horizontal Curves of Mountainous Freeways

Table 3

Iteration process of vehicle speed of the designated speed measurement tests in k1139+530~k1139+920 interval.

Iteration times	Clustering center
	Low-speed group	High-speed group
1	60.082	79.906
2	2.834	10.287
3	3.988	8.166
4	2.263	3.369
5	1.770	2.444
6	1.046	1.243
7	1.163	1.322
8	0.880	0.883
9	0.000	0.000