United States Permit Test Coach
Sign shapes and colorsQuestion 4 of 223

What shape and color do most warning signs have?

  1. A white rectangle with a red border
  2. A yellow diamond with a black border
  3. A green square with a white border
  4. An orange circle with a black border
Show answer

Correct answer: A yellow diamond with a black border

Most warning signs are diamonds. They have a black legend and border on a yellow background.

Source: Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD), 11th Edition with Revision 1 (FHWA, December 2025), Section 2C.02 Design of Warning Signs, page 188

Practice sign shapes and colors

Questions last reviewed: 18 October 2026