Which category warns drivers of traffic laws and regulations and constitutes an offense if disregarded?

Answer: A — Regulatory Signs

Regulatory signs communicate the rules you must follow on the road. They spell out legal requirements like speed limits, prohibitions (no entry, no turning, do not pass), and parking restrictions. Disregarding these signs is a violation of traffic laws and can lead to fines or other penalties because they enshrine the rules that govern how drivers must behave. This set is distinct from warning signs, which alert you to hazards or road conditions ahead, and from guide signs, which help you navigate to destinations or services. Parking signs are about where and when you may park, which is a specific type of rule, but the category that most directly warns drivers of laws and carries the offense-if-disregarded consequence is regulatory signs.