What is defined as the different paths that the front and rear wheels take when cornering?

The correct answer is off-tracking, which refers to the phenomenon where the front wheels of a truck take a different path than the rear wheels when the vehicle is making a turn. This difference occurs because the front wheels pivot and follow a tighter radius, while the rear wheels follow a wider arc due to their position further back. This can lead to complications, particularly in larger vehicles like tractor-trailers, as it increases the risk of the rear wheels encroaching into adjacent lanes or striking obstacles.

Understanding off-tracking is crucial for maintaining proper control of a tractor-trailer during maneuvers, especially in tight spaces or while navigating curves. It also highlights the importance of awareness concerning the vehicle's larger dimensions compared to standard-sized vehicles.

The other options do not describe this specific phenomenon: turning radius relates to the minimum space needed for the vehicle to turn, trailer sway refers to the lateral movement of the trailer while towing, and rear wheel steer deals with the ability of some vehicles to steer their rear wheels for enhanced maneuverability, but does not address the distinct pathways of the wheels during turns.