The most common color of warning signs is:
- Red.
- Yellow. ✓
- Green.
- Blue.
Answer: B. Yellow.
Yellow is the most common color for warning signs.
Why this is the answer
The handbook states that warning signs are normally yellow and diamond-shaped, and that they alert you to conditions ahead. Its color list matches that: yellow means a general warning or an advisory about unexpected roadway conditions. So when you see a yellow sign, read it as a heads-up about something coming up rather than as a rule you must obey or a direction to a service.
Why the other answers are wrong
- A. Red. — Red is used for stop, do not enter, wrong way, and yield signs, which are regulatory rather than warnings about conditions ahead.
- C. Green. — Green is used for guide or directional information, such as telling you where things are or which way to go.
- D. Blue. — Blue is used for driver guidance and to mark parking spaces for disabled drivers, not for general warnings.
Remember it
Think of yellow as a flashlight pointed ahead: it lights up a hazard before you reach it.