Cluster-Based Pavement Deterioration Models for Low-Volume Rural Roads

Table 9

(a) Rating for cross-drainage structure and (b) rating for the settlement of cross-drainage structure.

(a)  

Percentage of opening	Rating
Fully open	5
>75%	4
51%–75%	3
26%–50%	2
<26%	1

(b)  

Percentage of settlement	Rating
Nil	5
1–25%	4
26%–50%	3
51%–75%	2
>75%	1