Table 1.

Occupational Driver Behavior Questionnaire subscales, items and corresponding descriptions.

Subscales	Items	Descriptions
Speeding+	SP1	How often do you exceed the speed limit on a residential road?
	SP2	How often do you exceed the speed limit on a highway or freeway?
	SP3	How often do you exceed the speed limit when traveling to do pickups§?
Rule Violation	RV1	How often do you not signal to change lanes when no other traffic is around?¶
	RV2	How often do you perform a U-turn in a non-designated zone?
	RV3	How often do you not come to a complete standstill at a stop sign?¶
Inattention	IN1	How often do you drive while thinking about how to get to your destination?
	IN2	How often do you drive while thinking about your next pickupŦ or work task?
	IN3	How often do you drive while thinking about your work-related problems/issues?
Driving While Fatigued	DF1	How often do you drive while tired?
	DF2	How often do you have difficulty driving because of tiredness or fatigue?
	DF3	How often do you find yourself nodding off while driving?
Additional Items**	SP4	How often do you exceed the speed limit when travelling with a passenger?
	RV4	How often do you wear your seat belt while driving?
	IN4	How often do you use a handheld cell phone while driving?

Note.

^*Items are Likert-based with 5 options, ranged from 1 to 5, 1 being “Rarely/Never” through 5 being “Very often/all the time.” All items except for RV4 were reversecoded. (Newnam et al., 2011).

⁺Every item on Speeding began with ‘How often do you deliberately’ in the original 12-item ODBQ. For the current study we dropped ‘deliberately’ from each question for both versions of the ODBQ.

^§Modified from ‘travelling to clients or the office’.

^¶Removed ‘fail’ to not using a signal to change lanes and coming to a complete standstill for RV1 and RV3.

^ŦReplaced ‘next patient’ with ‘next pickup’.

^**Items SP4, RV4, and IN4 were not a part of the 12-item ODBQ (Newnam et al., 2011).