What is the requirement for using headlights during rain?

Using headlights when windshield wipers are in use is required as it enhances visibility for the driver and makes the vehicle more visible to others on the road. When it rains, the effectiveness of natural light diminishes, and headlights help illuminate the roadway and improve overall safety. By requiring headlights to be on with the use of windshield wipers, it ensures that drivers are adhering to safe driving practices during adverse weather conditions. This requirement is in place to compensate for reduced visibility caused by rain and to alert other drivers to the presence of your vehicle, particularly in low-light conditions or when rain creates a reflective surface that can further obscure visibility.