What is the process to achieve a perfect traffic planning system that contributes to smooth flow in transportation? Whenever we discuss the problems that most countries face in their journey, traffic jam is the first problem that looms on the horizon. Traffic congestion can be clearly defined as a physical phenomenon in which cars block the movement of traffic due to many factors. This phenomenon represents a huge challenge for most developed and developing countries. That is why it is the job of traffic plan engineers, a branch of civil engineering, to establish a strategic vision from different perspectives that manages this problem in such a way as to reduce its overall effect on society. As a result, traffic congestion usually takes on different aspects, manifests itself in many cases and causes multi-alternative processes. In general, three steps could be considered to build a transportation system that helps overcome traffic congestion: expand and rehabilitate roads, develop modern tunnels and bridges, and last but not least, build a subway system. achieve a smooth flow of traffic and one of the most effective steps is the expansion and rehabilitation of existing roads. However, road expansion is not so easy to achieve. It requires a great deal of effort, both on the part of the engineers and workers who carry out this expansion. According to Claitor (2003), road planning engineers examine the manifestations of general movement situations. They develop safer conditions by creating roads that lead to a smooth moving flow. Therefore, traffic engineers do not just design and implement a certain project, but spend most of their time solving... paper problems... because once people's dependence on cars is reduced, traffic problems will also be reduced. traffic will be reduced. Regardless of the role subways play in solving traffic problems, subways are safe, healthy and accessible to all. This step was taken by powerful developed countries like Turkey and has shown extraordinary results. That is why the construction of the subway is the complementary step and finishing touch to the previous steps. All in all, the three steps mentioned must be taken in sequence because each step paves the way for the next. Furthermore, these steps have been taken by powerful countries, both developing and developed, and have led to improving the situation of these countries in several aspects. And remember that traffic congestion can be very harmful in preventing a certain country from progressing if a shift is not adopted.