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 Texas handbook defines regulatory traffic signs as signs that instruct drivers what they should or should not do in certain circumstances. It adds that drivers must obey these signs the same way they obey traffic laws. That is exactly what the correct choice says: they tell you what you must do or must not do. The handbook also separates warning signs, which alert you to hazards ahead, from regulatory signs, so the answer is about the rule-setting job of regulatory signs, not about warning you of dangers or school zones.
Why the other answers are wrong
- A. Are placed in every location where there is a present danger. — The handbook does not say regulatory signs are placed at every location with a present danger; it describes them as signs that instruct drivers what to do or not do.
- C. Are diamond-shaped and yellow or green. — The handbook ties the diamond shape to warning signs, while regulatory signs are generally vertical rectangles.
- D. May warn drivers that they are approaching a school zone. — A school zone warning is a warning or school advance sign, not a regulatory sign; the handbook lists pentagon shapes for school advance and school crossing signs.
Remember it
Link “regulatory” to “rule”—the sign is telling you a rule you must follow.
Official handbook: Texas Driver Handbook (DL-7), Chapter 5: Signals, Signs, and Markers , p. 30