[Retracted] Pavement Performance Evaluation of Asphalt Expressway Based on Machine Learning Support Vector Machine

Table 7

Grade distribution of pavement structural strength index evaluation.

Rating	Upstream PSSI rating distribution		Downstream PSSI rating distribution		The distribution of PSSI assessment grades across the board
	Length (km)	Proportion (%)	Length (km)	Proportion (%)	Length (km)	Proportion (%)
Excellent	47	72.72	73	90.00	122	82.20
Good	14	22.74	8	8.76	24	15.08
Middle	2	3.04	2	1.26	4	2.06
Poor	1	1.53	0	0.00	2	0.69
Bad	0	0.00	0	0.00	0	0.00
Score	92.63		93.28		92.92
Grade	Excellent		Excellent		Excellent