Probability of Roadside Accidents for Curved Sections on Highways

Table 7

Threshold of significant factors leading to frequent roadside accidents.

No.	Vehicle speed (km/h)	Vehicle type	Horizontal curve radius (m)	Hard shoulder width (m)	Adhesion coefficient	Probability (>50%)
1	80 ≥ V > 60	Truck	300 <R ≤ 400	≤ 0.75	μ ≤ 0.2	≥55.9
2			200 <R ≤ 300	≤ 0.75	μ ≤ 0.6	≥54.3
3			R ≤ 200	≤ 1.50	μ ≤ 0.8	≥54.9
4	100 ≥ V > 80		500 <R ≤ 600	≤ 0.75	μ ≤ 0.2	≥54.2
5			400 <R ≤ 500	≤ 0.75	μ ≤ 0.8	≥55.0
6			300 <R ≤ 400	≤ 1.50	μ ≤ 0.8	≥54.8
7			R ≤ 300	≤ 2.25	μ ≤ 0.8	≥55.3
8	120 ≥ V > 100		500 <R ≤ 600	1.50 <  ≤ 2.25	μ ≤ 0.2	≥55.3
9				≤ 1.50	μ ≤ 0.8	≥54.3
10			R ≤ 500	≤ 2.25	μ ≤ 0.8	≥54.2
11	80 ≥ V > 60	Car	R ≤ 300	≤ 0.75	μ ≤ 0.2	≥54.2
12	100 ≥ V > 80		300 <R ≤ 400	≤ 1.50	μ ≤ 0.2	≥55.3
13			200 <R ≤ 300	≤ 1.50	μ ≤ 0.4	≥55.3
14			R ≤ 200	≤ 2.25	μ ≤ 0.8	≥54.2
15	120 ≥ V > 100		300 <R ≤ 400	≤ 2.25	μ ≤ 0.4	≥54.5
16			200 <R ≤ 300	≤ 1.50	0.4 < μ ≤ 0.6	≥54.6
17				≤ 2.25	μ ≤ 0.8	≥55.9
18			R ≤ 200	≤ 3.00	μ ≤ 0.8	≥54.3

Note. V represents the vehicle speed, R represents the horizontal curve radius, μ denotes the adhesion coefficient, and is the hard shoulder width.