Construction contributes to cities development. In Egypt, many projects had established using the accelerated method (ACM), others were traditional (TCM). Their life cycle cost (LCC) is analyzed to determine the benefit cost (BC) and decide the construction optimum way. In this paper, a Comparative study between LCC of ACM and TCM was held to improve the decision-making to form reasonable judgments on projects’ economics throughout their life cycle. The main question is what is the optimum way of construction to reach the highest benefit cost? Mustafa El-Nahass axis in Cairo studied, using LCC analysis to determine the development BC by analyzing the traffic impact before and after development. It was considered that operation cost (OC) of the axis were fuel and exhaust. Savings from OC by the ACM expressed by the case study BC. The main findings are that government entities should develop guidelines establishing the maximum time for construction. According to a prior study, extending construction time had no detrimental impact on public interest in these places. LCC study of the project was used to estimate this limit. This code specifies the regions to be classified based on traffic and population, and the maximum time for construction.