Table 3. Frequency and length of trail deterioration of its type and class.

Type	Single deterioration				Composite deterioration
	Class	Heavy	Moderate	Light	Heavy	Moderate	Light
Deepening	Fre.(%)	1.7	0.8	8.1	2.7	6.7	3.4
	Length(km)	0.08	0.04	0.35	0.11	0.29	0.15
Widening	Fre.(%)	1.9	-	2.9	2.7	3.8	2.7
	Length(km)	0.08	-	0.12	0.11	0.16	0.11
Rock-exposed	Fre.(%)	-	-	0.6	1.8	2.6	1.6
	Length(km)	-	-	0.03	0.08	0.11	0.07
Slope erosion	Fre.(%)	-	0.9	2.2	-	-	-
	Length(km)	-	0.04	0.09	-	-	-
Root-exposed	Fre.(%)	-	-	-	0.2	0.9	0.2
	Length(km)	-	-	-	0.01	0.04	0.01
Water erosion	Fre.(%)	-	-	-	0.6	-	-
	Length(Km)	-	-	-	0.02	-	-
Total	Fre.(%)	3.60	1.70	13.80	8.00	14.00	7.90
	Length(Km)	0.16	0.08	0.59	0.33	0.60	0.34