What is a potential consequence of not using seat belts on a bus?

Choosing not to use seat belts on a bus can significantly increase the risk of injury during sudden stops. When a bus makes a sudden stop, passengers who are not secured by seat belts can be thrown forward due to the inertia of their bodies. This can lead to a range of injuries, from minor bruises to serious trauma, depending on the speed of the bus and the nature of the stop. The safety measures in place, such as seat belts, are designed to keep passengers securely in their seats and reduce the possibility of injury in the event of a collision or abrupt maneuver.

The other options do not pertain to the critical safety aspect of seat belts. Increased comfort for passengers is not accurate, as having seat belts can make a ride feel safer, and security of luggage is more related to how items are stored rather than the use of seat belts. Likewise, improved aesthetics of the bus has nothing to do with passenger safety and the protective role of seat belts.