Where should the shoulder harness be positioned for safe usage?

The shoulder harness should be positioned across the shoulder and chest for safe usage. This placement is crucial for providing the maximum level of protection in the event of a collision. The design of the seatbelt is intended to distribute the force of a crash over the stronger parts of the body, namely the chest and shoulders, which helps to prevent serious injuries and keeps occupants securely in their seats.

When the shoulder harness is properly worn across the chest, it also allows for more mobility and comfort while driving, which contributes to overall safety by ensuring that the driver can fully focus on operating the vehicle without distractions. Proper positioning also helps to keep the passenger restrained within the safety of the vehicle during sudden stops or impacts. The other options, such as placing the harness under the arm, across the abdomen, or behind the back, significantly reduce its effectiveness and increase the risk of injury in the event of an accident.