What type of sign indicates a no entry area for trucks?

The type of sign that indicates a no entry area for trucks is a regulatory sign. Regulatory signs are designed to inform drivers of specific laws or regulations that must be followed. In the context of a no entry area for trucks, these signs are legally enforceable, which means that failure to comply can result in penalties or fines. The purpose of these signs is to ensure safety and maintain proper traffic flow by restricting certain vehicles from entering areas where they may pose a hazard or where their presence is not permitted.

In contrast, warning signs alert drivers to potential hazards or changes in road conditions, but they do not possess the authority of a law. Informational signs provide useful information, such as directions or points of interest, and guide signs help drivers navigate their route but do not confer restrictions or mandates on vehicle movement. Thus, only regulatory signs carry the power to enforce restrictions like those pertaining to truck entry.