Left panel: Scatter plot of the presented TTC at occlusion as a function of the intended TTC, across all trials presented in the experiment. The presented TTC was always slightly longer than the intended TTC (indicated by the diagonal). Purple: vehicle speed 10 km/h. Red: 30 km/h. Green: 50 km/h. Right panel: Scatterplot of the presented motion duration as a function of intended TTC. The intended duration of 3 s is indicated by the gray horizontal line.