With rapid urbanization worldwide, cities are struggling to provide sustainable public transportation and are heavily investing in mass transit services like Bus Rapid Transit. This research aims to estimate the cost and benefits of the Pakistan Metrobus Service (PMS) (Rawalpindi-Islamabad). A mixed-method methodology is applied to analyze the cost and benefits of PMS. The study is descriptive, exploratory, and qualitative in nature. Financial data was collected from PMS, and for Pedestrian Shed concept data was collected from Google Maps, and the interview was conducted from government experts to dig deep down the policy context. Pakistan Metrobus System (PMS) is a state-of-the-art mass transit service operating in Islamabad and Rawalpindi, jointly known as twin cities. The PMS aimed to ease commuting in the twin cities, uplift the poor’s and provide a sustainable transit system to the residents of Islamabad. However, the cost-benefit analysis shows a different picture of the PMS. According to the international benchmarks, the cost of PMS is 65 percent higher than the normal transit system. The project’s payback period shows that it cannot cover its investment cost and requires an additional PKR 71 billion to keep the project running till 2035. The project relies heavily on subsidies and cannot cover half of its operating cost. The biggest problem with the PMS is that it is not accessible to the general public. The pedestrian shed concept was applied to the PMS, and the results show that it is merely accessible to 50 percent of the population residing in a close circle of 5 minutes. Supervisor:- Muhammad Aqeel Anwar