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The different types of traffic signs are recognizable by shape and color—as long as drivers can see them. Repair and replace signs as soon as possible. Drivers depend on signs to get where they’re going without danger. To ensure that critical signage is visible and where it should be, the Manual on Uniform Traffic Control Devices issues requirements and guidelines. The different types of traffic signs have different purposes, shapes, colors, and time frames for...

Recognizing what different traffic sign shapes mean can be the difference between life and death. Here are the nine basic shapes lining roads today. Traffic existed long before traffic signs did, as more cars on American roads started heading in different directions at different speeds. In the early 1900s, drivers navigated by looking for colored bands wrapped around poles, and in 1915, Detroit installed the first black-and-white stop sign. But in low visibility conditions, these signs just didn’t do the job. As cars entered the mainstream, the potential for accidents became more alarming. By the 1920s, automobile organizations agreed that traffic control signs needed to be standardized so that drivers from anywhere could understand them. Shapes could instantly communicate in any language. Even if you hadn’t passed a test on what different traffic sign shapes meant, you soon realized that smoother curves were used for friendlier messages, while the...