Final answer:
Regulatory signs on the roads state speed limits, parking regulations, and rules regarding turning and passing movements. They ensure traffic flows smoothly and safely by informing drivers of the pertinent laws and regulations. The correct answer to what regulatory signs state is 'All of the above'.
Step-by-step explanation:
Regulatory signs are essential for managing traffic flow and ensuring safety on the roads. These signs include information such as speed limits, parking regulations, and directions regarding turning and passing movements. Regarding the question, 'What do regulatory signs state?', the correct answer is 4) All of the above. They are designed to inform drivers of the laws and regulations that must be followed. For example, a sign indicating the de jure speed limit is easily recognizable and is enforced by law enforcement to promote safe driving. However, common practice or the de facto speed limit might differ slightly, recognizing a small margin within which law enforcement typically forgives minor speeding violations. Meanwhile, parking regulations help manage space and traffic in areas where parking space is limited or where parking might obstruct traffic flow.
Turning and passing movements are also regulated to prevent accidents and ensure a smooth traffic flow. This includes signs that indicate where U-turns are prohibited or where lane usage is restricted. Understanding and following regulatory signs is crucial for all road users, as they contribute to organized traffic and reduce the potential for accidents.