The development of a microcomputer-based integrated location and transporation model

The development of integrated urban models has been conducted in the past two decades. This study develops a microcomputer based integrated urban model which examine the interrelationships between location and transportation, based on the properties of the Putman's integrated urban models. First, the process of software development is illustrated, and the restrictions and assumptions necessary to modify such a model on a microcomputer environment are described. Secondly, this study illustrates how the microcomputer version can be used to forecast land use and transportation in a hypothetical urban area. Thirdly, the sensitivity of the version to changes of land use and transportation in the hypothetical urban area is tested to examine the behavior of the microcomputer based integrated urban model. The microcomputer version developed in this study determines travel costs or times in the network, the simultaneous residential location and trip distribution, and the traffic volume on each link, according to the method of incremental full network reloading for the traffic assignment. This study finds that the simultaneous residential location and trip distribution are determined by the relative proportion of attractiveness and accessibility characteristics, and the residential allocation is quite affected by the congestion effects on the network. A change in job generation and attractiveness of land use affects the distribution of residences in other zone, as well as the zone in which the change occurred. A change in the network structure and transportation function shows a rather complex impact on residential locations and loaded link volumes.