Mathematical Approach toward Eliminating Traffic Congestion as seen in Visual Illusion Phenomena

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The traffic congestion at "sags" is caused by the enhancement of fluctuations due to the visual illusion where drivers are not able to correctly perceive the slope of the road and fail to realize that it is going uphill. As one solution to correctly perceive road inclination, we proposed drawing stripe patterns on both sides of a road. We investigated how people would perceive slopes in respect to these stripe patterns, and examined the effectiveness of the solution proposed. Moreover, the variation in speed depends on the presence or absence of Delboeuf illusion patterns was also investigated on the real road situation.