What inhibits the operation of a three-point seatbelt?

The combination of factors inhibiting the operation of a three-point seatbelt is critical for ensuring safety in vehicles. According to German traffic regulations, proper use of seatbelts is mandatory for both drivers and passengers.

1. **Wearing a thick winter coat** can interfere with how the seatbelt fits, creating slack that increases the risk of injury during an accident. This reflects the importance of ensuring that the seatbelt is snug against the body.

2. **Passing the belt under both arms** is a misuse of the seatbelt. It can prevent the seatbelt from functioning correctly, increasing the likelihood of injury. German law specifies that seatbelts must be used as designed, which means they should cross the body properly.

3. **Not fully locking the belt into the harness buckle** means that the seatbelt may not secure the occupant effectively. In the event of a collision, an unlatched or improperly latched seatbelt can fail to protect the passenger as intended.

Understanding the correct operation of seatbelts is essential, as they are one of the primary protective measures in vehicles. Selecting all relevant options ensures that the seatbelt performs its function of restraining occupants effectively, thereby reducing the risk of injury or death in the event of an accident.