What maneuver should you avoid while driving a tractor-trailer?

Avoiding rapid lane changes without checking mirrors is essential for safely operating a tractor-trailer. This maneuver can be particularly hazardous due to the vehicle's size and weight, which impacts maneuverability and stopping distance. Rapid lane changes can lead to collisions with other vehicles, as the driver may not be aware of blind spots or surrounding traffic. The importance of thorough mirror checks cannot be overstated, as they allow the driver to assess their surroundings and ensure that the lane change is safe.

In contrast, gradual lane changes, the use of turn signals, and maintaining a steady speed are all recommended practices that contribute to safe driving. Gradual lane changes provide other road users with time to react, using turn signals communicates intentions to other drivers, and maintaining a steady speed helps in controlling the vehicle's momentum and reacting appropriately to road conditions.