Abstract:In view of the current highway vehicles overrun and cause problem such as traffic safety hidden trouble, a system based on digital image processing that measure the vehicles’ surpass length, extra-wide, ultra-high is proposed. Using CCD camera to capture the slowly moving vehicles image in the driveway, after image classification, background removal, noise removal to improve image clarity, according to the maximum ROI line extraction algorithm to extract ROI longest pixel lines, then through the camera calibration to get vehicle actual dimensions information. The system for the overrun vehicle’s detection without parking, effectively improve the rate of road traffic. The experimental data show that the system for different types of vehicles, has good accuracy and robustness.