Evaluation of Section Speed Enforcement System Using Empirical Bayes Approach and Turning Point Analysis

Table 2

Descriptive statistics for crashes in both the treated group and the comparison group.

Group	Period	Mean	Standard deviation	Min	Max
Treated group (SSES)	Before	19.1	15.03	3	54
	After	11.4	6.97	3	25
Comparison group	Before	22.0	14.66	10	47
	After	22.6	11.19	13	40