Stop ahead sign: what it means

Stop ahead warning sign: a yellow diamond with a small red octagon and a black arrow pointing up to it
Drawing: DriveQuiz, based on MUTCD sign W3-1. Simplified; real signs follow the FHWA Standard Highway Signs specifications.

The Stop Ahead sign warns that there is a STOP sign ahead that you might not see in time. Start slowing down.

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What it means

MUTCD Section 2C.35: Stop Ahead, Yield Ahead and Signal Ahead signs are installed on an approach to a STOP sign, YIELD sign or traffic signal that drivers cannot see from far enough away to react in time. A curve or a hill can hide it, and so can trees or parked vehicles.

They may also be used for extra emphasis even when the sign can be seen.

Where you see it

Before STOP signs hidden by a curve, a hill or other obstructions.

A common mistake

Braking hard at the last moment. Ease off early so you can stop smoothly at the line.

Quick quiz

Why is a Stop Ahead sign used?

  1. The STOP sign may not be visible in time
  2. The road is closed ahead
  3. Only trucks must stop
Show answer

A. The STOP sign may not be visible in time. Section 2C.35: it is used where drivers cannot see the STOP sign from far enough away. Source: MUTCD 11th Edition, Chapter 2C, Warning Signs and Object Markers: Section 2C.35, FHWA; MUTCD 11th Edition, FHWA

Compare with

Next in warning signs: Signal ahead sign. See all warning signs or the full road signs list.

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Sources

  1. MUTCD 11th Edition, Chapter 2C, Warning Signs and Object Markers: Section 2C.35, FHWA
  2. MUTCD 11th Edition, FHWA. FHWA lists the current version as the 11th Edition with Revision 1, dated December 2025

Sign pictures are our own simplified drawings of the MUTCD designs, which are in the public domain (MUTCD Section 1D.06). Sources and image credits.