sentences:  Their purpose is to observe all possible obstacles or impediments to the swift and safe transfer of the Load between two points and warn drivers about what's approaching.The Lead Pilot Car warns approaching drivers in the opposite lane, and the trailing car warns any candidates to overtake or pass the Load.The driver of the pilot car must have a 2-way radio communication system (often CB radio or handheld FRS radios) to alert all members of the move about any low bridges, wires, obstacles, etc.