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I hope others can post something similar to this topics here. I saw a TV programme about road accident investigation explained how road design and optical illusions cause traffic accidents. One of it showed how two drivers who travel at about the same speed, (45 degree left or right away from each other) towards the same intersection might not have realised each other's presence, because of the same speed that doesn't appear as a "moving object" that "alert" the mind, even under bright daylight with open field only at the side. Unfortunately I can't find a good video yet.