What should you be aware of while riding on highways?

Answer: B — Road obstacles and sudden lane changes

While riding on highways, being aware of road obstacles and sudden lane changes is crucial for ensuring safety. Highways often have various types of vehicles, including trucks and cars, that can change lanes unpredictably. Riders must be vigilant to anticipate these movements and react accordingly. Additionally, highway conditions can include debris, potholes, and other obstacles that may require quick maneuvering to avoid. Understanding your surroundings also helps in maintaining a safe distance from other vehicles, allowing you to react to any sudden changes in traffic. While other factors such as traffic patterns and availability of rest areas can be important, they do not directly impact the immediate safety concerns that come with unpredictable road hazards and the behavior of other motorists. Awareness of these aspects allows for a more defensive riding approach, ultimately enhancing rider safety.