Pilot cars are vehicles that drive in front or in back of a truck carrying heavy freight. They are there to warn drivers and pedestrians that there might be delays and obstacles due to the oversized equipment bing moved. They also alert the truck if there is anything in the way,if they need to slow down due to traffic, accidents, or anything else that the truck driver would need to be aware of. Their job is to make sure everyone is safe and that the equipment arrives at it’s destination safely.
Usually pilot cars are trucks or vans with yellow signs saying ‘Oversized Load’ or something similar.
Many states require pilot cars if your freight is especially large or tall, although the exact size when it becomes a requirement depends upon the state. How many pilot cars are necessary depends on the state and size of the cargo, some only require one in front.