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The conventional method to estimate O-D matrices requires very large surveys such as: home and roadside interviews; which are very expensive, labor intensive, and subject to large errors. Previous research has been able to obtain the O-D matrices by using steady-state traffic counts information. ATCS ( Area Traffic Control System ) already installed in Bandung since 1997 provides us the real-time traffic count information for all signalized intersections. The technology for transferring data via internet is also available and at a very low cost. The paper will explain the dynamic phenomena in estimating the O-D matrices in a real-time basis based on real-time traffic count information. This model can be used to study the day-to-day evolution of the O-D matrix relating to traffic flow fluctuation. Having known the real-time O-D matrix, several analysis and applications in a real-time basis can be conducted for solving urban transportation problems.
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