Transportation is the most important and most current problem of Istanbul,like other entire metropolitan cities. People lose lots of money and time because of transportation and related congestions. Rapid development and unplanned urbanized area have reduced mobility of the people on the existing roads. Another point that should be stated here are roads which have been built without thinking about today's population and future situation. However, building roads was just part of the problem because rapid and unplanned creation of the industrial and residential sites have caused transportation problems, along with many environmental problems.