Application of the Empirical Bayes Method with the Finite Mixture Model for Identifying Accident-Prone Spots

Table 1

Summary statistics of characteristics for individual road segments in the Texas data for Periods 1 and 2.

Variable	Period 1 (1997 and 1998)			Period 2 (1999–2001)
	Min.	Max.	Mean (SD)	Min.	Max.	Mean (SD)
Number of crashes	0	59	2.93 (4.81)	0	78	4.58 (7.81)
Average daily traffic over the study period ()	40	24000	6391 (3835.01)	43.33	25333.3	6761.8 (4149.84)
Lane width (LW) (ft)	9.75	16.5	12.57 (1.59)	9.75	16.5	12.57 (1.59)
Total shoulder width (SW) (ft)	0	40	9.96 (8.02)	0	40	9.96 (8.02)
Curve density (CD)	0	18.07	1.43 (2.35)	0	18.07	1.43 (2.35)
Segment length () (miles)	0.1	6.28	0.55 (0.68)	0.1	6.28	0.55 (0.68)

SD: standard deviation.