. Author manuscript; available in PMC: 2018 Jan 31.

Published in final edited form as: Proc Int Driv Symp Hum Factors Driv Assess Train Veh Des. 2017;2017:9–15. doi: 10.17077/drivingassessment.1608

Table 1.

Coded dimensions in 20-second segments from each video clip in three domains of interest

Domain	Dimension	Examples
Driver State	Sleepiness	Slow eye lid closure, fixed gaze, rubbing eyes, yawning, low facial and bodily muscle tone, leaning/ holding neck/head (each scored from 1 (low) to 4 (high))
	Attention to Driving	Driving related gaze movements (e.g., checking mirrors, scanning the road ahead)