Final answer:
Constantly observing the road while driving means to continually scan the entire road and all roadsides to maintain situational awareness and ensure safety.
Step-by-step explanation:
Constantly observing the road while driving refers to the act of continually scanning the entire road and all roadsides. This is not just about focusing solely on the car ahead or frequently checking the mirrors, nor is it about glancing occasionally at the GPS. The goal of continuous observation is to maintain situational awareness, ensuring that the driver is aware of all surroundings, including other vehicles, pedestrians, road conditions, and potential hazards. This type of vigilance is necessary for safe driving and helps to anticipate and react promptly to any unexpected events that may occur on the road.