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The Permit Test
Stop Sign Ahead (MUTCD W3-1 sign)

Stop Sign Ahead

warning sign · diamond · yellow

A stop sign is ahead but not yet visible. Begin slowing now.

Visual breakdown
Yellow diamond with a small red octagon and an upward arrow.
Shape recognition
Diamond containing a mini stop sign — a warning about a regulation.
Color recognition
Yellow diamond wraps the red octagon: caution now, command ahead.
Memory trick
It's the stop sign's messenger — when the messenger appears, the king (octagon) is close behind.
Real-world example
Used before stop signs hidden by vegetation or curves, where braking late would mean skidding into the intersection.
Common mistakes
Waiting until the actual stop sign is visible to start braking.
Quick recall method
Mini octagon in a diamond = start braking now.