In this paper, we present a traffic-sign knowledge application on Android system. The objective of this system is to support and advice user to learn and test traffic signs and driving rules in Thailand based on mobile application. It makes benefits for users to learn and know the means of traffic signs and how to drive correctly in Thailand. After learning the specific lessons of application, users will take a specific test and know their result immediately. In this project, it was divided the result by the research purposes into 2 parts: developing the Mobile application for traffic-sign knowledge and testing and evaluating the system. Questionnaires were used to measure user satisfaction with system usability by specialists and users. The results were satisfactory as followed: Means for specialists and users were 4.15 and 4.37, and standard deviation for specialists and users were 0.583 and 0.644 respectively. Further analysis showed that the quality of a traffic-sign knowledge system was also at a good level as well.

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