What are the large blind spot a old trucks called?

The large blind spots on old trucks are commonly referred to as "no zones." These areas are the regions around large vehicles where the driver's visibility is limited, making it difficult for the driver to see other vehicles, especially smaller ones, that may be in close proximity. No zones are typically located directly behind the truck, directly in front, and on both sides, particularly the right side. It's important for other drivers to be aware of these blind spots to maintain safe driving distances around large trucks.