sentences:  The Lead (front position) Pilot Car often has a calibrated High Pole (and depending upon the state, a durable, fade-resistant yellow sign) bolted to its front bumper.The High Pole is designed to collide with overpasses, power lines and tree branches that may be above the lane in which the Pilot Car and the Load are operating.The Lead Pilot Car Operator transmits radio messages to the Load and other necessary vehicles of overhead obstructions or road conditions that require the Load to alter its path or stop.