What is the requirement for passing a safety inspection regarding the condition of lights?

For a vehicle to pass a safety inspection, it is essential that all lights are operational. This includes headlights, tail lights, indicator lights, parking lights, and brake lights. The primary purpose of this requirement is to ensure the safety of both the driver and other road users, as functioning lights are crucial for visibility and communication on the road. Having operational lights helps prevent accidents during low visibility conditions, such as at night or in inclement weather.

In contrast, the other options suggest that only certain lights need to function or imply that certain lights are not necessary at all, which does not align with safety regulations. Each light plays a vital role in a vehicle's signaling and visibility systems, making it crucial for all of them to be operational for a successful inspection. This comprehensive approach to lighting contributes to overall vehicle safety standards.