Which sign shape is used to indicate a slow-moving vehicle?

• A. Triangle
• B. Circle
• C. Diamond
• D. Rectangle

Answer: (A)

A triangle is used because shapes that alert drivers rely on quick, instinctive recognition. The sign for a slow-moving vehicle is a triangular emblem mounted on the rear of the vehicle, often a bright, reflective orange triangle with a red border. The triangular shape stands out and signals drivers to exercise caution and allow extra space because the vehicle ahead may be traveling much slower than surrounding traffic.

Other shapes serve different purposes: circular signs tend to regulate or indicate specific actions or railroad warnings, diamond signs warn about road hazards ahead, and rectangular signs convey information or directions. The triangle’s distinct form is what immediately signals you to slow down and be ready for slower speeds.