Evaluating the Effect of Roadway and Development Factors on the Rural Road Safety Risk Index

Table 7

Examination of the obtained risk value based on the proposed risk index and its comparison with that of the other studies for each cluster.

Cluster	Proposed study based on collected data					Leur and Sayed’s study [62]
	Operating speed	Difference between posted speed limits and the operating speed	Risk degree	Accident frequency ratio	Risky index (predicted value) (Eq. 2)	Accident frequency rate (consequences)	Probability	Exposure	Final risk
1	56.66	−17.34	Relatively high risk	0.80	1.62	12.12	0.013	3	0.476
2	62.65	8.10	Relatively low risk	0.53	2.02	10.12	0.027	1	0.275
3	91.79	41.02	Not risk (safe)	0.01	0.14	7.83	0.058	0	0.00
4	81.80	27.77	Low risk	0.12	0.59	12.4	0.012	1	0.146
5	97.53	18.69	Moderately risk	0.75	1.98	9.06	0.039	2	0.708
6	88.00	−0.75	High risk	1.87	14.81	11.1	0.019	3	0.636