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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

Diamond

Used for warning signs

Vertical rectangle

Used for regulatory signs

Horizontal rectangle

Used for guide signs, some warning signs, and temporary traffic control signs

Trapezoid

Used for recreational area guide

Upside down triangle

Exclusively for YIELD signs

Pennant

Exclusively for No Passing Zone signs

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