Once the transportation survey has collected all the details of the existing tripmaking pattern and the socio-economic, land-use and trasportation-system characteristics of the survey area, the second stage in the transportation planning process is the development of relationships between the total number of trip origins and destinations in a zone and the zonal characteristics. It is assumed that these relationships will be true in the future and so, if land-use and socio-economic factors can be predicted, future trips can be estimated for any proposed transport system.
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