Table 12: Calculation and scoring method according to assessment items.

IndexSubindexAssessment elementStandardScore

Geometric feature ( )Horizontal curve ( )Number of curve sections (%)Under 10≤40
10–20≤60
20–30≤80
30–50≤100
Sight distance ( )Number of sight distance defect sections (%)Under 10≤40
10–20≤60
20–30≤80
30–50≤100
Longitudinal slop ( )Number of longitudinal slope sections (%)Under 10≤40
10–20≤60
20–30≤80
30–50≤100
Lane width ( )Mean lane width (m)3.5–3.75≤40
3.25–3.5≤60
3–3.25≤80
Under 3.25≤100
Shoulder width ( )Mean of shoulder width (m)Nonpavement100
0–1.5Interpolation
Above 1.5