The document discusses vehicle-to-vehicle (V2V) communication and proposes using ultrasonic sensors, ZigBee technology, and buzzers to enable communication between vehicles. It describes how ultrasonic sensors would work to measure distance and outlines some key features of ZigBee for wireless transmission of sensor data. The goal is to develop a cooperative collision warning system to help prevent accidents by providing early alerts to drivers. Future work may involve using GPS, WiFi, cameras, or signals from traffic boards to expand communication capabilities.