Regulatory signs:
- Are placed in every location where there is a present danger.
- Indicate what a driver must or must not do. ✓
- Are diamond-shaped and yellow or green.
- May warn drivers that they are approaching a school zone.
Answer: B. Indicate what a driver must or must not do.
Regulatory signs indicate what a driver must or must not do.
Why this is the answer
The handbook's traffic controls section says regulatory signs control traffic. They set limits or tell drivers what they should or should not do, and the law enforces them. The color list also ties white and black signs to regulatory information that controls traffic, sets limits, or gives commands. That matches the idea that these signs tell you what you must do or must not do, rather than serving as general warnings.
Why the other answers are wrong
- A. Are placed in every location where there is a present danger. — The passages do not say regulatory signs are placed in every location where there is a present danger; they describe signs generally and separately mention warning colors.
- C. Are diamond-shaped and yellow or green. — Diamond-shaped yellow or green signs are not described as regulatory; yellow is listed for general warnings, and regulatory signs are tied to white and black.
- D. May warn drivers that they are approaching a school zone. — A sign warning drivers about a school zone fits the handbook's high-emphasis warning color for school activity, not the regulatory category.
Remember it
White and black means rules you must obey; yellow means warning.