Freeway Travel Speed Calculation Model Based on ETC Transaction Data

Table 3

The result for training speed reduction coefficient α.

Speed reduction coefficient	Peak periods			Off-peak periods			All day
Test data group	Average value of α	STDEV	Sample size	Average value of α	STDEV	Sample size	Average value of α	STDEV	Sample size
1	0.83	0.02	6	0.84	0.02	8	0.83	0.02	14
2	0.95	0.04	6	0.94	0.03	8	0.94	0.03	14
3	0.95	0.07	6	0.94	0.02	8	0.94	0.05	14
4	0.86	0.03	6	0.87	0.02	8	0.87	0.02	14