Circle - Exclusively for railroad advance warning signs


Octagon - Exclusively for STOP signs


Crossbuck - Exclusively for railroad grade crossing signs


Pentagon - Used for school advance warning signs and county route marker signs


Rectangle, Longer Dimension Vertical - Used for regulatory signs

Diamond - Used for warning signs

Rectangle, Longer Dimension Horizontal - Used for guide signs, some warning signs and temporary traffic control signs

Trapezoid - Used for recreational area guide signs and National Forest route markers

Equilateral Triangle, Point Down - Exclusively for YIELD signs

Pennant - Exclusively for No Passing Zone signs

Other shapes Typically used for route marker signs

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