What does the term "no zone" refer to?

The term "no zone" specifically refers to the blind spots around large trucks where smaller vehicles may not be visible to the truck driver. This concept is crucial for road safety, as it highlights the areas surrounding commercial vehicles where drivers of passenger cars should exercise caution. Vehicles entering these "no zones" may not be seen by the truck driver, increasing the risk of collisions. Understanding the dimensions of these blind spots allows drivers to make informed decisions about when it is safe to overtake or partner with large trucks on the road.

The other options do not accurately capture the meaning of "no zone." While safe parking areas and regions where vehicles are prohibited provide important information about traffic management, they do not relate to the visibility challenges posed by large trucks. Traffic zones under surveillance address law enforcement and safety measures but do not pertain to the specific visibility issues inherent with large vehicle operation.