The Phan Trung Lam creator Oudheusden, Dirk L. van Chairperson Fujiwara, Okitsugu Examination Committee Huynh, Ngoc Phien Examination Committee The Australian Government Scholarship Donor text th Bangkok Asian Institute of Technology 1991 monographic eng

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85 p. The conventional Urban Transportation Planning (UTP) model is an essential and integrated model and has been useq in many transportation studies to estimate the origin - destination (0-D) trip matrix. The gravity distribution model is easy to apply and petforms well in many cases. Unfortunately, the UTP process with the gravity model is found to be insensitive to the changes of the transportation system. On the other hand, the gravity model's theoretical background is not very clear. This study tries to introduce some improvements upon this model. The approach includes utilization of mathematical optimization techniques to formulate and solve the trip distribution model. Enhancement to the model's behavioral richness has been made by introducing the activity and system accessibility measures into both the trip generation and the trip distribution model. The mod l implementation can be divided into following steps: Firstly, the system accessibUity measures are computed based on the transportation system's current state. These measures are then used along with the other socioeconomic characteristics to calibrate the trip generation model. Second step consists of calculating the combined accessibility measures and classifying the inter-zonal trip distributions by trip lengths and trip accessibility indices. The trip distribution is solved as the entropy maximization problem with these constrai~ts, using the simple and efficient Bregman's balancing algorithm. The model's error is estimated by some well-tested goodness of fit measures. The proposed methodology has been applied to the case study: to estimate the 0 -D trip matrix for Greater Bangkok Area's transportation network. The model has been found to petform well for this large size real-world problem. The results show some improvements to the previous studies using conventional models. Although not all variance of the model could be tested due to short time and limitation of available data, but it is found the newly involved accessibility measures can act as the key to improve the model's system-sensitivity. A thesis submitted in partial fulfillment of the requirement for the degree of Master of Science, School of Engineering and Technology Thesis (M.Sc.) - Asian Institute of Technology, 1991 Transportation Thailand Bangkok Mathematical models Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B17687 http://203.159.5.9/ait-thesis/detail.php?q=B17687 300698 20260818171006.0