Development of a Safety Evaluation Model for Provincial Highway

Table 12

Calculation and scoring method according to assessment items.

Index	Subindex	Assessment element	Standard	Score
Geometric feature (𝐹2)	Horizontal curve (𝐹21)	Number of curve sections (%)	Under 10	≤40
			10–20	≤60
			20–30	≤80
			30–50	≤100
	Sight distance (𝐹22)	Number of sight distance defect sections (%)	Under 10	≤40
			10–20	≤60
			20–30	≤80
			30–50	≤100
	Longitudinal slop (𝐹23)	Number of longitudinal slope sections (%)	Under 10	≤40
			10–20	≤60
			20–30	≤80
			30–50	≤100
	Lane width (𝐹24)	Mean lane width (m)	3.5–3.75	≤40
			3.25–3.5	≤60
			3–3.25	≤80
			Under 3.25	≤100
	Shoulder width (𝐹25)	Mean of shoulder width (m)	Nonpavement	100
			0–1.5	Interpolation
			Above 1.5	—