evaluation and preferring of rapid public transit systems in tehran metropolis with topsis and shannon entropy technique

1- introduction transportation and traffic is one of the major issues and challenges that are facing urban managers. so that it has become one of the major challenges in the political area. transport is one of the most important elements of urban development which is used for people and goods moving from a different geographical place to other places. in order to achieve efficient productive in urban areas transportation is needed. tehran metropolis along with their many problems has encountered with a wide problem in public transport area. in order to solve the traffic problems in tehran during the last years, there have been discuss and controversy among different authorities of urban management (state and municipal) for choosing urban rapid transportation system for metropolis tehran. this paper sets out to evaluate and prioritize a variety of bus and rail transportation system for tehran metropolis by using mcdm approach. 2- theoretical framework urban transportation as part of the overall transportation system is one of the components of municipal communication system. its purpose is better accessing among the different land users within a city, work traffic and people and goods movement among these adapted areas. in urban transportation systems and choosing various models usually time interval is more important than distance and geographical location. totally the urban transportation means people and goods movement within cities. these movements which are influenced by the exchange of goods and services and social and recreational activities in the cities, not only affects on the size of the urban construction and urban development but also it depends on choosing desired transportation system as well as the size and its urban structure of the area. basically, urban transportation is defined in three broad categories, including: public transportation, personal transportation, and goods transportation. however, the general objective of public transportation is providing mobility and better accessing to mass or certain parts of the city. the efficiency of this form of transportation is for people who move a lot. in fact, the public transportation system refers to a system that anyone can use it under defined conditions, such as buying a ticket. 3-methodology this research is based on studies and analysis library was built. first, based on library research and theoretical literature on foreign sources are mostly based on indicators used in relation to a variety of rapid transit systems were determined and the following data were collected for each indicator. then the topsis algorithm and the indexes into different systems for metropolitan tehran were prioritized. 4- discussion based on existing studies, tehran subway system has accounted first rank, having the minimum distance to the closest ideal level. after the subway system, brt transportation system has a second rank. above calculations show that monorail system is dedicated the latest rank. this indicates that subway system has been resolving the public transportation problems in tehran due to the quality parameters and the greatest potential desirability. in contrast, monorail systems have a very low priority and capabilities. the result of the study shows that the urban managers of tehran must consider subway transportation system development as the most fundamental and desirable choice to solve the problem. regarding high cost and time assuming of the subway system in whole country, they can use the other rake choice, brt system to solve existing problems. 5- conclusion and suggestions transportation systems have basic role not only in economic life of countries but also in citizens’ life. transportation and traffic issue have an important and sensitive role in a community’s quality and socio-economical structure. the basic need of modern urban life is transportation. determining transportation system is one of the challenges that often arise in the context of sustainable development in cities. transportation system which is affected the pattern and structure of city in some extent. considering the importance and necessity to evaluate and prioritize different transportation systems particularly rapid public transportation systems, this paper used topsis approach and shannon entropy and mcdm techniques to prioritize and evaluate these systems in tehran metropolitan which finally, conducted studies on the basis of criteria indicated that subway system has maximum capacity of public transportation desirability in tehran. in contrast the monorail systems have low priority. therefore, urban managers in tehran metropolis can use subway system as the main option for long-term and other systems such as the brt for short-term strategies to solve public transportation problems in city.