Final answer:
A U-turn sign is a type of traffic regulatory sign, which is important for directing traffic and ensuring safety on the roads.
Step-by-step explanation:
A U-turn sign is an example of a traffic regulatory sign. These signs are crucial for directing drivers and ensuring safe and orderly traffic flow. They instruct drivers about traffic laws and regulations, such as the ability to make a U-turn at a certain location. Regulatory signs are usually recognizable by their distinctive shapes and colors; for instance, U-turn signs often have a circular shape with a U-arrow symbol. It's important for all drivers to understand and comply with these signs to maintain safety on the roads.