United States Permit Test Coach
Sign shapes and colorsQuestion 1 of 223

Which sign is the only one that uses an octagon?

  1. YIELD sign
  2. DO NOT ENTER sign
  3. ROAD CLOSED sign
  4. STOP sign
Show answer

Correct answer: STOP sign

Only the STOP sign is an octagon. Other signs do not use this shape.

Source: Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD), 11th Edition with Revision 1 (FHWA, December 2025), Section 2A.05 Shapes, page 83

Practice sign shapes and colors

Questions last reviewed: 18 October 2026