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Yield signs kind of look like "Y's," if you're really looking to make some connection there And railroad signs are circular because trains have circular wheels, right?Question 4 A railroad crossing warning sign has the following shape and color A Threesided and yellow B Diamond shaped and orange C Round and yellow D Square and white ANSWER C Circular (round) traffic signs mean there is a railroad crossing aheadThe most common road sign shapes are circles, triangles and rectangles Circular signs are used to give orders; Road Signs And Their Meanings Drive Safely Net What are the shapes on road signs