Why is it important to have a proper following distance in a large vehicle like a truck?

Having a proper following distance in a large vehicle like a truck is crucial primarily because it provides enough space for braking. Trucks typically have a longer stopping distance compared to smaller vehicles due to their size and weight. When a truck follows another vehicle, maintaining a safe distance ensures that in case of sudden stops or emergencies, the driver has sufficient time and space to react and bring the vehicle to a halt without colliding with the one ahead. This margin is particularly important in maintaining safety, as it allows for the truck's inertia and braking mechanisms to function effectively.

The other options, while potentially relevant in different contexts, do not capture the primary concern regarding following distances as effectively. For example, while visibility can be improved with more distance, the key factor in a truck's operation is the ability to stop safely. Speeding up efficiently and making lane changes easier may be considerations, but they are secondary to ensuring that the vehicle can stop in time to prevent accidents.