Structural-functional explanation of the Physical development on transit oriented development in metropolitan cities (Case study: Tehran metropolitan)

Today, with the physical growth of large cities and increasing intra-urban travel, the issue of transportation and the achievement of an optimal spatial development pattern based on public transport are of great importance. In this regard, recognizing the structural and functional constraints of cities in the spatial distribution of utilities, services and population, how to balance the economic, social and physical capacities of the city with transport potential, can lead to favorable spatial development strategies. So, this paper, by analytical-exploratory method, explores and explains the structural-functional urban development based on the TOD system in the traffic area of Tehran. Library and field studies have been used to collect information. For data analysis, spatial information system methods such as optimal access index, inverted interpolation (IDW) and network analysis based on the weight overlay of layers have been used with ARC GIS 10.3 software. Research indicators also include population density, land use, user diversity, and use of activity centers and network capacity of the road. The research findings showed that despite the high capacity of Tehran's transportation system, it has 17 km of radial bus lines (BRT) and 41 stations; 38 km of subway lines and 40 stations; and 107 km of bus lines with 317 stations; Inappropriate. On the other hand, 63% of the scope of the Mobility Index is located in the "high" area. As a result, due to the distribution of inappropriate applications, people daily diverge intra-city trips to receive services from a variety of locations. As a result, it seems to be necessary to restrict the use of private cars, the withdrawal of inappropriate and incompatible uses, encouraging people to walk and bike, and to keep the population in range and prevent the change of residential usage.