Evaluating Effect of Operating Speed on Crashes of Rural Two-Lane Highways

Table 1

Descriptive information of the study segments.

Variables	Unit	Statistics
		Min.	Max.	Mean	Standard deviation
AADT	Vehicles	2	19619	1456	1895
Segment length (L)	Mile	0.10	2.97	0.48	0.30
Average speed	mph	5.36	69.67	38.94	10.37
Speed limit	mph	10	55
The 85^th percentile speed	mph	9.10	70	47.90	8.77
Difference between average speed and speed limit	mph	−49.64	20.66	−14.07	10.98
Difference between the 85^th percentile speed and speed limit	mph	−45.87	32.78	−5.11	9.41
Crash frequency in 5 years		0	173	2	4