Bluetooth is a new short-range wireless technology designed to enable wireless communication between diverse devices. It is gaining increasing popularity and acceptance in the world today. There is a growing body of research on the subject, but very few, if any of the analyses, provide a balanced view of the technology, which describe its pros and cons and implications for businesses. The key features of Bluetooth technology are robustness, low power, and low cost. Now-a-days, the car users expect more and more accessories available in their cars, but these accessories available are able to control by user manually using different and standalone controllers. When any car comes close together Bluetooth device sends warning signal to the car. Based on the type of warning signal received the computer sends signal to the brake control system to slow down the speed of the car. There are two types of control signals. First type of signal control the speed of the car and the second type of signal is to overtake the car which is moving forward.