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

Table 2

ANOVA test for the examination of the effect of roadway and development factors on the accident frequency rate.

Results of significance analysis of roadway factors
Results of significance analysis (operating speed)
	Sum of squares	df	Mean square	F	Sig.
Between groups	218.24	93	2.35	625.77	0.000
Within groups	0.05	12	0.00
Total	218.28	105
Results of significance analysis (the difference between posted speed limits and operating speed)
	Sum of squares	df	Mean square	F	Sig.
Between groups	218.24	96	2.27	454.66	0.000
Within groups	0.05	9	0.01
Total	218.28	105
Results of significance analysis (segment length)
Segment length	Sum of squares	df	Mean square	F	Sig.
Between groups	35.41	33	1.07	0.42	0.996
Within groups	182.87	72	2.54
Total	218.28	105
Results of significance analysis (volume)
Volume	Sum of squares	df	Mean square	F	Sig.
Between groups	5.900	3	1.967	0.945	0.422
Within groups	212.38	102	2.082
Total	218.28	105
Results of significance analysis (the presence or absence of a speed control camera)
Presence or absence of a speed control camera	Sum of squares	df	Mean square	F	Sig.
Between groups	0.49	1	0.49	0.23	0.629
Within groups	217.79	104	2.09
Total	218.28	105
Results of significance analysis (homogeneous sections)
Homogeneous sections	Sum of squares	df	Mean square	F	Sig.
Between groups	5.71	5	1.14	0.53	0.751
Within groups	212.41	99	2.15
Results of significance analysis (gradient)
Grade	Sum of squares	df	Mean square	F	Sig.
Between groups	0.69	2	0.35	0.17	0.849
Within groups	217.59	103	2.11
Results of significance analysis of development factors
Results of significance analysis (dominant land uses along the roadways)
Dominant land uses along the roadways	Sum of squares	df	Mean square	F	Sig.
Between groups	4.45	2	2.22	1.07	0.346
Within groups	213.84	103	2.08
Total	218.28	105
Results of significance analysis (the number of accessibility)
Number of accessibility	Sum of squares	df	Mean square	F	Sig.
Between groups	9.77	9	1.086	0.50	0.871
Within groups	208.51	96	2.172
Total	218.28	105

Note. All the italic coefficients are not statistically significant. It is significant at the 0.05 level.