A diamond-shaped sign is a:
- Road hazard sign. ✓
- Interstate route sign.
- School crossing sign.
- Speed limit sign.
Answer: A. Road hazard sign.
A diamond-shaped sign is a road hazard sign that warns you about conditions ahead.
Why this is the answer
The handbook says warning signs are normally yellow and diamond-shaped. They alert you to what is coming up and what to watch for. Construction and maintenance signs can also be diamond-shaped and warn of unusual or potentially dangerous conditions near work areas. That fits the road hazard sign answer: the diamond shape is used to warn drivers, not to give route information or set a speed limit.
Why the other answers are wrong
- B. Interstate route sign. — The handbook uses green for guide or directional information, and it does not describe interstate route signs as diamond-shaped hazard warnings.
- C. School crossing sign. — The passages never identify a diamond shape as meaning a school crossing; they tie the diamond shape to warning signs for conditions ahead.
- D. Speed limit sign. — Speed limits are regulatory information, and the handbook groups white and black signs as regulatory controls, not the diamond warning shape.
Remember it
Diamond means danger ahead: think warning sign, not route sign or rule sign.