The exponential growth in urbanization around the globe has resulted in a population density in narrow residential areas. It brings along many problems and has a negative impact on sustainable city life. The high traffic congestion is one of the leading problems of city life in the most crowded city of Turkey, Istanbul. The research aims to provide information and knowledge regarding the policy formulation process for transportation in İstanbul. It also includes the discussion of the backgrounds of the “smart city” concept, and the subject in question, based on technological theoretical foundations such as “Internet of Things” and “Internet of Everything,” and aims to examine the factors to determine criteria to be a smart city citizen. Although these factors seem similar to each other, they involve different elements as well. This situation leads to the differences between the indexes developed for a smart city. We will evaluate the seven smartest cities in the world (London, Singapore, New York, Chicago, Amsterdam, Barcelona, and Paris), and examine the smart city applications of these cities to find a solution for the transportation problems by assembling the seven indexes that Hoffman refers to. The conclusion includes the adaptable applications we will examine, to deal with the transportation problem of Istanbul.