What is required of vehicles that operate during bad weather conditions regarding visibility?

The correct answer is that vehicles operating during bad weather conditions are required to have their headlights on. This requirement enhances visibility for the driver and makes the vehicle more visible to others on the road. Headlights are essential in conditions such as rain, fog, or snow, where natural light is insufficient. The use of headlights not only aids in the driver’s observation of the surroundings but also signals the presence of the vehicle to others, reducing the likelihood of accidents.

Special markings or reflective materials may be beneficial in certain situations, but they do not specifically pertain to the basic requirements for visibility during poor weather conditions. Width limitations are primarily related to vehicle specifications for safe road usage and do not directly influence visibility. While reducing speed is a prudent measure in bad weather, it does not directly address the visibility requirements mandated for vehicle operation under such conditions.