Many researchers have advocated transit oriented development or compact city concept. However, it is necessary to obtain the rational reason on the urban policy by quantitatively grasping a part of effect of transportation mode on the city growth engineeringly.In this reason, we developed a simple simulation model that can compare the differences between automobile-oriented and transit-oriented cities, and clarify the difference between city forms by transportation modes. Following a theoretical model development, a series of simulation runs are tried. The model allocates people who commute to CBD from residential zones along a transportation corridor. As a result of many simulation analyses, it is shown that automobiles need much more traffic space in comparison with the transit as is shown by the proposed traffic space ratio both in CBD and along the corridor. In this paper, the improvement on the model is proposed using LP. It is the improvement for the purpose of would be able to apply for the more general city. Through the trial, we confirm that the solution exists.