Fig. 2

Logarithmic 2D histograms of vertical and horizontal gaze directions from all participants. Glances towards the forward roadway reside in the origin of the plots; the speedometer is located 20° down, the left mirror is located approximately −35° horizontally and −15° vertically, the center rear-view mirror about 30° horizontally and 5° vertically, and the secondary task display is located about 35° horizontally and −35° vertically. The color coding represents the height of the distributions. The main mode of the distribution, colored in dark red, indicates that the driver is looking straight ahead at the forward roadway. The peak to the right of the main mode is the center rear-view mirror; the peak below is the instrument cluster; and the peak below the rear-view mirror represents the secondary task screen