At what age does a passenger become responsible for fastening their own seat belt?

Explanation: It's the driver's legal responsibility to ensure that all passengers under 14 years old wear a seat belt, or are fastened in an approved child restraint. However, it's good practice to ensure that all other passengers wear seat belts as well.

Category: Band 3 driving test

References: The Official DVSA Guide to Driving: Section 2, Highway Code: Rule 100