Table 9: Significant variables and the possible reasons for the signs, single truck violations.

Variable	Relationship	Possible Reason	Possible Reason
Female	Increase the risk of not keeping proper lane.	Have higher score for errors and violations.	Have higher score for errors and violations.
Non residence	Increase the risk of driving too fast for the condition and failing to keep proper lane.	Lack of familiarity with mountainous areas in Wyoming.	Lack of familiarity with mountainous areas in Wyoming.
Weekend	Increase the risk of driving too fast and failing to keep proper lane.	Less traffic and higher speeds.	Less traffic and higher speeds.
Off peak hours	Increase the risks of all these violations.	Possible fatigue.	Possible fatigue.