The stop sign intersecting the orange plane is an example of a line perpendicular to a plane, which means a line that forms a right angle goes through a plane. Stop signs are a common traffic symbol. These signs are usually found at intersections and are red. Stop signs are one of the most important road sign. I found this image online: http://www.consumerreports.org/cro/news/2009/01/how-often-do-you-chance-risky-behavior/index.htm
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