What must be practiced for road safety?

The correct answer highlights the importance of using seat belts for road safety. Wearing seat belts is a fundamental practice that significantly reduces the risk of injury or death in the event of a vehicle accident. Seat belts are designed to restrain occupants, prevent ejection from the vehicle, and minimize the force experienced during a collision.

In contrast, the other options emphasize practices that could compromise safety. The use of mobile phones while driving distracts the driver and increases the likelihood of accidents. Ignoring traffic rules poses severe risks not just to the driver but also to other road users. While seat belts and helmets contribute to safety, focusing solely on those overlooks additional critical safety measures, such as obeying traffic laws and being attentive while driving. Overall, practicing the use of seat belts embodies a core principle of road safety by encouraging responsible and protective behavior on the road.