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Manual on Uniform Traffic Control Devices (MUTCD) arrows logo
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The Shape - and Color - Give Us a Sign

WARNING signs alert drivers to existing or potentially hazardous road conditions.
Several warning signs help drivers anticipate sharp turns or curves in the road.
Usually diamond-shaped and yellow, warning signs caution drivers that the road is slippery when wet; there is an intersection ahead, the lanes narrow, or there may be bicyclists, farm animals, or wildlife on or near the roadway.
The pentagon shape with the point to the top warns us to watch for school children. The new color for these signs - fluorescent yellow-green - is much easier to see in low light and foggy/rainy weather.
Pay attention to the round yellow WARNING sign - there's a railroad crossing ahead.
Yellow pennant-shaped signs caution motorists where passing is unsafe.