What is the primary purpose of a regulatory sign?

• A. Control the movement of traffic
• B. Warn of hazards
• C. Inform about road conditions
• D. Provide directions to parking

Answer: (A)

Regulatory signs are meant to control how traffic moves by enforcing actions drivers must take. They establish legal requirements that keep intersections and roadways orderly and safe, such as stopping at a red stop sign, not entering a restricted lane, or obeying a posted speed limit. Because these signs dictate mandatory behaviors, they directly govern movement on the road.

Hazard warnings alert you to potential dangers ahead, informational signs describe road conditions or services, and parking-related signs guide or inform rather than require a specific driver action. That’s why regulatory signs are the best answer: they set the rules that regulate traffic flow.