Analysis of Nonsevere Crashes on Two- and Four-Lane Urban and Rural Highways: Effects of Wet Pavement Surface Condition

Table 1

Descriptive statistics of the nonsevere crash rates occurring on dry pavement surfaces and tests of normality for the selected eight routes.

Route ID	Length (mi)	N	Mean	St. Dv.	Normality Test
					Skewness	Kurtosis	Sig.
AL 001	353	420	481	694	2.751	8.940	0.001
AL 005	198	161	364	551	3.698	21.575	0.001
AL 006	240	172	375	509	2.813	10.802	0.001
AL 008	218	141	371	456	2.381	7.048	0.001
AL 010	231	122	345	579	4.327	22.885	0.001
AL 012	232	170	368	545	3.133	11.862	0.001
AL 016	77	84	480	695	2.730	9.350	0.001
AL 017	347	178	357	522	4.424	28.303	0.001
Combined	1896	1448	405	592	3.223	13.629	0.001

Significance level for both S-W and K-S tests, with the level of significance <0.01. All routes combined. Number of segments.