What is essential to check for effective night driving?

Effective night driving involves visibility as a critical component for safe operation of the vehicle. Ensuring that all windows, mirrors, and lights are clean is essential because any dirt, grime, or obstruction can significantly reduce visibility. Clean windows allow the driver to see the road and potential hazards clearly, while clean mirrors assist in monitoring other traffic. Additionally, properly functioning lights not only illuminate the path ahead but also ensure that the vehicle is seen by others on the road, which is crucial during nighttime conditions. This combination of factors contributes to overall safety and efficacy in driving at night.

While the other options pertain to aspects of vehicle operation and comfort, they do not directly address visibility, which is paramount for night driving. The functionality of the radio, the smooth running of the engine, and the operation of the air conditioning, while important for general driving experience, do not have the same immediate impact on safety during nighttime driving conditions.