The intercity private O-D matrix is very important but difficultly collected data in Taiwan. To save the cost of collecting above data , it is possible to use traffic flows on existed freeway to estimate the O-D matrix. Most existing mothods must use the on-off ramps flows to estimate the O-D matrix , but in Taiwan we just have the observed flows on all of the ten toll stations. So this research will develop a serial estimating methods which use above flows data and a prior O-D matrix to estimate the intercity private O-D matrix in Taiwan.
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