With the trends of rapid urbanization in developing cities and automobile dominance in many countries, there is a need to explore policies and plans that will allow transportation to enable quality of life for urban citizens in a sustainable manner. Mass public transportation systems, such as Bus Rapid Transport (BRT) systems, are often cited in research and planning documents as true alternatives to auto dependence for both urbanizing and developed cities. In view of this, the sustainability state of the first Bus Rapid Transits System to be designed and implemented in Lagos state, Nigeria was evaluated based on sustainable objectives in this research work. Data were collected through the use of closed ended questionnaire that was administered to a cross-section of BRT users using random sampling technique, the basics for the evaluation used was the Sustainable Transport Appraisal Rating (STAR) as designed by the Asian Development Bank ADB. Findings revealed that the overall rating of the system is marginally sustainable with the three core dimension of sustainability rated as followed; economic sustainability as marginally economically sustainable, social sustainability as moderately socially sustainable, environmental improvement as moderately environmentally sustainable, and fourth bottom line-transport system efficiency as marginally positive. Our study concludes that the system is marginally sustainable with some impacts needed to be mitigated in the operation of the route such as improvement in quality of service and reliability which will also have impact on its economic sustainability.

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