What are the primary purposes of traffic signs?

Answer: D — Regulatory laws, warning, and guide

The primary purposes of traffic signs are to regulate the flow of traffic, warn drivers of potential hazards or changes in road conditions, and provide guidance and information to drivers. Regulatory signs inform drivers of laws and regulations they must obey, warning signs alert drivers to upcoming hazards such as curves, intersections, or road work, and guide signs provide directions, route numbers, and other useful information to help drivers navigate. Therefore, option D, which includes regulatory laws, warning, and guide, is the correct answer.