When and How to Use Hazard Lights Correctly
Last reviewed: 2026 · Driviology Road Safety Education Team
Quick Answer
Hazard lights should be used when a vehicle is stopped, disabled, or moving well below normal traffic speed, and generally should not be used while driving at a normal speed in traffic.
Hazard lights are simple to activate, but knowing exactly when to use them - and when not to - avoids confusing other drivers.
Appropriate Uses
Stopping briefly due to a breakdown, pulling over on a shoulder, or moving well below normal speed all justify using hazard lights, as covered in our broader guide to emergency flashers.
Uses That Can Confuse Other Drivers
Using hazard lights while still driving at a normal speed in traffic removes the specific directional information other drivers rely on from regular direction indicators.
A Simple Rule of Thumb
If your vehicle is not stopped, disabled, or moving unusually slowly, hazard lights are probably not the right signal to use.