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Traffic information is undeniably essential to every one especially for commuters. With accurate and up to date traffic information, a better traveling plan can be made, which translates to reduction in time and energy consumption. Consequently, overall society and environment can benefit from traffic information. This paper presents a study of impact of intelligent traffic information system (ITIS) on congestion saving in Bangkok. We propose to utilize both static and dynamic traffic information in order to find the least congested route. The results revealed that up to 75% congestion saving can be achieved with ITIS.