Which feature is NOT typically assessed during a safety inspection?

The assessment of vehicle features during a safety inspection primarily focuses on elements that directly impact the safety and operability of the vehicle. Seatbelt functionality, for example, is crucial as it ensures that passengers are secured during an accident, thus contributing to their safety. Windshield integrity is important as well; a clear and intact windshield is essential for visibility and overall driving safety. Engine efficiency may also be indirectly considered in safety contexts, as a poorly functioning engine can lead to hazardous situations on the road.

In contrast, sound system quality does not have a direct impact on the safety or mechanical operation of the vehicle. While an effective sound system may enhance the driving experience, it does not influence the safety of the vehicle or its occupants. Therefore, sound system quality is typically not a part of the safety inspection checklist, making it the correct answer to identify what is not usually assessed.