The lane position can enhance the safe driving and help the development on ITS(Intelligent Transportation Systems) . In this thesis, we combine Image Processing with Inter-Vehicle Communication to get the lane position. The front car on the lane sends the detected lane position and its license plate information after it detected the lane position by itself. Because of the block of the front car, the back car on the lane can't detect the lane position by itself. At this time, the back car will try to detect the license plate information of the front car on the same lane. The back car will compare the detected license plate information of the front car with the license plate information sent out from the front car. If 2 license plate information are the same, the back car will get the lane position.