Traffic sign recognition can help the driver to make a right decision at the right time for safe driving. The realization of traffic sign recognition system usually divided into two stages: detection and classification, This paper presented an algorithm for detection of traffic sign using convert region of interest (ROI) polygon to region mask method. The algorithm detects the traffic sign from the images captured from different environment and different position angle. The proposed method extracted the detected sign in black and white pixels and further classified into groups. In this paper introduces the main difficulties in road sign recognition with further discussion on the potential trend of road sign recognition.