SUMMARY – when we turn our heads quickly, our vision is shut down in a series of ‘saccades’… this causes ‘saccadic masking’… drivers at junctions turn their heads quickly left and right, and generate saccades… if the motorcycle falls behind a saccade, the driver can appear to look right at the bike and yet will not see it…
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Photo credit Paul Townsend https://www.flickr.com/photos/brizzlebornandbred/20001313491