Shapes of Traffic Signs & Their Meanings


A responsible motorist should know the different types of traffic signs. Road signs give a driver various types of information or warnings depending on the shape, color and placement of the sign. According to the Manual on Uniform Traffic Control Devices (MUTCD), a sign must meet five requirements: fulfill a need, command attention, convey a simple meaning, command respect from travelers and give adequate time for proper response.

Stop signs are designed to command attention and communicate a clear message.
Stop signs are designed to command attention and communicate a clear message. (Image: Jupiterimages/Comstock/Getty Images)


The octagon is a regulatory sign because it informs motorists to do, or not do, something. This shape is exclusively used for stop signs. The stop sign is reflective to show the same shape and color during both the day and night. Stop signs have a red background with white letters and border.

Stop sign
Stop sign (Image: Thinkstock/Comstock/Getty Images)


The diamond is a warning sign; alerting drivers to potentially hazardous road conditions ahead. These warning signs can alert drivers to a sharp curve ahead, caution drivers the road is slippery when wet or alert drivers of a hidden intersection. Warning signs have a yellow background with black letters and border.

Diamond sign
Diamond sign (Image: Jupiterimages/ Images)


The circle is a regulatory sign to inform drivers they should not be doing something. This sign is a red circle outline with a slash through the middle, across a black symbol of the prohibited action. These signs inform drivers not to enter, perform a U-turn or turn left or right.

Round street sign
Round street sign (Image: Jupiterimages/ Images)


The pentagon is another type of warning sign, specifically alerting drivers to watch for schoolchildren or pedestrians nearby. These signs are a fluorescent yellow-green for easier visibility in low light and foggy and rainy weather.

Pedestrian crossing sign
Pedestrian crossing sign (Image: Thinkstock/Comstock/Getty Images)


The triangle is a different type of regulatory sign that alerts drivers to slow down because another direction of traffic has the right of way. This shape is reserved exclusively for the yield sign. The yield sign has a white background with a wide red border and letters.

Diamond sign
Diamond sign (Image: Digital Vision/Digital Vision/Getty Images)


The pennant is a warning sign that inform drivers not to pass traffic in front of them. This sign is placed at the beginning of, and at intervals, along a zone where sight distance is restricted or where other conditions make passing traffic dangerous.

Penant sign
Penant sign (Image: Jupiterimages/Polka Dot/Getty Images)


There are two different shapes of rectangular signs: vertical and horizontal. Vertical signs are regulatory signs, informing drivers of speed limits, weight limits and railroad crossings. Horizontal signs can be used for a variety of needs. A horizontal sign could inform drivers of a one-way street, a possible road hazard or as a mile marker.

rectangle sign
rectangle sign (Image: Hemera Technologies/ Images)

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