Transportation networks have become a subject of scientific interest from the second half of the twentieth century. Studies related to growth of the transportation networks after resuming its activity after thirty years have changed focus from the topological complexity of transportation network to their structural properties. In other words, topological complexity has changed into structural complexity. In this paper, this lost scientific direction will be reminded to the present society. Firstly, early studies on the topological complexity will be summarized and compared to each other. Secondly, new studies will be summarized and analyzed in terms of topological complexity. Finally, in conclusion, a means of measuring the topological complexity will be discussed and gaps in current studies will be highlighted.