To enhance safety while driving a combination vehicle, what must a driver practice?

To enhance safety while driving a combination vehicle, practicing awareness of the vehicle’s dimensions and surroundings is crucial. Combination vehicles, which include tractor-trailers and other large vehicles, have significantly different handling characteristics compared to standard cars. Being acutely aware of the vehicle's size helps in maneuvering through traffic, making turns, and avoiding obstacles.

Awareness of one’s surroundings also includes understanding blind spots, which are much larger for combination vehicles. Maintaining this awareness allows drivers to anticipate the actions of other drivers and pedestrians, enhancing overall safety. This practice reduces the likelihood of accidents, as it equips the driver to respond effectively to various driving situations.

In contrast, the other options present harmful practices that could jeopardize safety on the road. Frequent lane changes without signaling can confuse other road users, while driving at high speeds compromises control and reaction time. Ignoring the weight of the cargo can lead to instability and make it difficult to stop or maneuver, increasing the risk of accidents.