Monthly Attenuation Prediction for Asphalt Pavement Performance by Using GM (1, 1) Model

Table 1

PCI and PQI of three typical representative lines of the main highway in Hunan Province.

Year of detection	PCI			PQI
	Line 1	Line 2	Line 3	Line 1	Line 2	Line 3
Early 2012	—	—	100	—	—	97.59
Early 2013	100	100	98.24	97.4	96.96	96.07
Early 2014	98.14	97.59	93.35	95.33	95.32	92.44
Early 2015	90.57	90.89	88.54	89.85	90.88	89.48
Early 2016	83.43	86.79	81.89	84.72	86.44	83.85
Early 2017	76.93	81.41	77.86	79.84	82.40	81.01
Early 2018	70.86	77.31	72.90	75.25	78.41	77.16