When must mopeds be equipped with lights?

Mopeds are required to be equipped with lights only at night when operated on public roads. This provision is rooted in traffic safety laws, which aim to ensure that all vehicles, including mopeds, are visible to other road users during low-light conditions.

The requirement focuses specifically on nighttime operation because visibility is significantly reduced after dark, making it crucial for moped operators to have adequate lighting to signal their presence and intentions. This regulation helps prevent accidents and enhances safety for both moped riders and other motorists.

While the provided options highlight different scenarios for the need for lights, the correct answer emphasizes the necessity of lighting during night-time operation on roads, aligning with legal stipulations that promote road safety. This allows moped riders to navigate safely and be seen by drivers of other vehicles during hours of decreased visibility.