Table 3.

Frequency count of risky driving behaviors coded from constant-threshold triggered video events for Intervention Groups 1 and 2 and Control Group 3 combined for the entire study period, where severity score was 3 or 4 only (multiple behaviors could be coded from a single video event).

Category	Total event count	Percent
Unsafe stopping	2814	36.0
Failure to attempt to stop at stop sign, incomplete stop at stop sign, failure to attempt to stop at light, incomplete stop at light, false start
Driving unbelted	1542	19.7
Driver seatbelt unfastened (≤20 mph), driver seatbelt unfastened (>20 mph), passenger seatbelt unfastened
Distractions (smoking, eating, etc.)	1093	14.0
Smoking, beverage, food, reading paperwork, other task, passenger(s), grooming/personal hygiene, mobile phone – talking (hands free)
Mobile use handheld	1053	13.5
Mobile phone – talking (handheld), operating other mobile device, mobile phone - texting/dialing
Speeding	681	8.7
Exceeding maximum fleet speed, moderate speeding (≤10 mph over limit), excessive speeding (>10 mph over limit)
Unprofessional driving	177	2.3
Rude gesture, unsafe backing, unsafe turning, unsafe braking, driving the wrong way - off roadway, unsafe lane change/merging/passing, curb check/jumped curb, raised voice, unsafe railroad crossing, lane departure/straddling lanes, competitive/aggressive driving
Fatigue	164	2.1
Yawning, drowsy/falling asleep
Situational awareness	47	0.6
Not scanning road ahead, not checking mirrors, unsafe following (≤1 s), unsafe following (1.25–2 s), unsafe following (2.25–3 s)
Other events	249	3.2
Driving with two hands off wheel, captured roadway incident
Total	7820	100