Which vehicles in a funeral procession are required to have their headlights on?

Answer: C — All vehicles in the procession

All vehicles in a funeral procession are required to have their headlights on to enhance visibility and ensure the safety of the procession as a whole. This practice is vital because it helps alert other drivers on the road that they are encountering a procession, which may be traveling at slower speeds and requires special consideration. By turning on headlights, all vehicles make the procession more recognizable, reducing the potential for accidents and ensuring that other motorists are aware of the presence of multiple vehicles moving together in a line. This requirement is part of the laws in many jurisdictions, including Wisconsin, to promote the safe passage of funeral processions.