In Maryland, when are headlights required to be used?

Using headlights from sunset to sunrise and during adverse weather is essential for safety and visibility on the road. In Maryland, it is legally required to have your headlights on during nighttime hours to ensure that you and other drivers can see clearly and be seen by others. Adverse weather conditions, such as rain, fog, snow, or heavy storms, can significantly reduce visibility. Therefore, using headlights during such conditions is crucial to alert other drivers to your presence and enhance your own ability to see the road and obstacles.

The other options do not encompass the full scope of the regulations. For instance, headlights are not limited to daytime use or merely when traffic is heavy, as visibility can be poor regardless of traffic volume. Additionally, while driving on rural roads may necessitate headlights in certain situations, it is not the only instance in which they must be used, which is why the chosen answer is the most comprehensive and accurate.