What does the "No-Zone" concept in truck driving refer to?

The "No-Zone" concept in truck driving specifically refers to the blind spots around a truck where the driver cannot see other vehicles. Trucks, due to their size and design, have limited visibility and substantial blind spots directly in front, behind, and on both sides. Understanding these blind spots is crucial for safe driving, as vehicles entering these areas may not be seen by the truck driver, leading to potential collisions. Therefore, it's essential for drivers of smaller vehicles to be aware of these No-Zone areas to maintain a safe distance and avoid dangerous situations, especially when merging, changing lanes, or making turns. The other options presented do not accurately depict the significance or definition of the No-Zone concept.