Yes. some are yellow and shaped circle with black 'X' and R R . and some are just the 'X' shape and white in color with 'railroad crossing' in black. one word for each piece of matieral that is used
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None, but we have a couple square-shaped.
A Cross-buck *Added - These signs, with the words RAIL ROAD CROSSING, are required at nearly all publc highway-railroad grade crossings in the US, and are generally mounted within 20 feet of the actual crossing. In Canada, a set that is white with red border is replacing the US type.
There are various reasons that manholes are shaped like a circle. For example, it is much easier to dig a circular hole.
the earth is a sphere but if you look at it as a 2d shape it is a circle
A circle perhaps