What shape is typically used for warning signs?

Warning signs are typically shaped like a diamond. This distinctive shape serves a specific purpose in road signaling; it attracts the attention of drivers and indicates a potential hazard or change in road conditions ahead. The diamond shape is easily recognizable and universally used for warning signs, making it an effective means of conveying important information quickly to motorists.

While other shapes are used for different types of signs—for instance, octagons are used for stop signs, horizontal rectangles are commonly used for informational or guide signs, and triangles are associated with yield signs—the diamond configuration is specifically reserved for warnings. These features help maintain road safety by preparing drivers for conditions that may require increased caution.