Formulation of the road supply index based on the land use patterns and street functions for major residential areas

South Korea recently has made many housing market efforts including the development of new towns and major residential areas. Much of the developed land was allocated for new road networks. However, since the road ratio which is the primary indicator for determining the necessary land size is based on the ratio of total road area to total land area, it may lead to wrong decisions. This study formulated a road supply index for a major residential area by comparing the relationships between land use patterns and vehicle speeds. This can account for the effects of the land use patterns, population size, and the road function. Also, to prevent an unbalanced amount of road supply, practical ranges for each road function was established. Finally, a case study was done for validation. The new index should be useful in determining an appropriate level of road supply in a major residential area.