Why should you stay out of the open space to the right of a semi-tractor-trailer?

You should stay out of the open space to the right of a semi-tractor-trailer because this area is often a blind spot for the truck driver, making it difficult for them to see smaller vehicles. Additionally, large trucks have wide turning radii and may encroach on that space when making turns. Staying clear of this zone helps prevent potential accidents and ensures safer driving conditions for all road users.