DATA SET 5: Mike Land's Car Driving Data SetEXPERIMENT DESCRIPTION
curvature = 1/(bend radius) = = θ2 / 2d,
where θ is the angle of the tangent point from the current heading (i.e. the gaze angle if the tangent point is fixated), and d is the distance of the driver’s head from the inner lane edge. Subsequent simulator studies (detailed in Land, 1998) showed that drivers monitor both θ and d simultaneously. Since at low-to-moderate speeds steering wheel angle is proportional to path curvature, θ and d provide the driver with a direct control signal for steering.
Fig 1: The drive shown in the videos begins at the entrance to Queen’s Drive (top left) and proceeds to the bottom of the picture (Note videos are left-right reversed). Picture from Google Maps.
Fig 2: Four frames from a video of a drive around Queen’s Drive showing typical gaze directions (white dot) on a left-hand and right-hand bend (top), a straight segment, and while looking off-road at a jogger. Note that the subject’s eye occupies the lower third of each frame and unlike the videos themselves the frames are not left-right reversed. The scrap of tape attached to the windscreen allows head movements to be monitored.
Fig 3: Contour plots showing the density of fixations (relative to the maximum value) made by three drivers for the whole route shown in Fig 1. The show all left-hand bends (top), straight segments, and right-hand bends. The central 1.0 maximum has the approximate value of 0.12 fixations deg-2.s-1. Note the strong peaks centred within 1º of the tangent points.
SCANPATH (EYE-TRACKER) DATA