Final answer:
Vehicles in a funeral procession are generally required to turn on their headlights and tail lights for identification and safety purposes, although laws can vary by location.
Step-by-step explanation:
All vehicles in a funeral procession are typically required to have their headlights and tail lights turned on. This is often mandated by law to help identify the vehicles that are part of the procession and to ensure their safe passage through traffic. It is also a way to show respect for the deceased and their family. While the specifics can vary by jurisdiction, the general practice is for all vehicles in a funeral procession to turn on their headlights and tail lights as a signifier to other drivers.