The proposed 4MB project is a groundbreaking greenfield transport infrastructure development, unprecedented at this scale for a sub-national entity in Nigeria and potentially all of Africa.
The 4MB project aims to address the rapid urbanization occurring in mid-Lagos, both on the mainland and Island, by extending infrastructure to the Eastern region, including Epe, Ikorodu, and Ibeju-Lekki.
The 4MB project will serve as a vital alternative route connecting the Island to the mainland in Lagos State, Nigeria. This initiative will significantly advance Nigeria’s goal of increasing its infrastructure stock from the current 20-25% of GDP to at least 70% of GDP by 2043.
The design of the 4th Mainland Bridge was delivered using a Transport Oriented Development (TOD) scheme. This approach ensures that the infrastructure development provides comprehensive access to local and city-wide opportunities and resources for all road users.
Additionally, a robust appraisal framework was developed to enhance the quality of investment decisions for transport infrastructure projects. This framework, previously not utilized for such projects, is capable of assessing the three pillars of sustainable development: economic, environmental, and social impact. The framework is now a focus of academic research, with some scholars pursuing it at the Ph.D. level. This advancement will facilitate more informed decision-making regarding transport infrastructure projects in the country.
The 4th Mainland Bridge project (4MB) is a proposed Public-Private Partnership (PPP) transport infrastructure development, featuring the construction and operation of a greenfield, tolled road and bridge designed for a speed of 120 km/hr. Spanning 37 km, this project is divided into three sections: Island, Lagoon, and Mainland. It begins at the Abraham Adesanya junction on the Island and terminates at the Lagos-Ibadan Expressway on the mainland. Key features of the 4MB project include:
- A 32 km, 4-lane dual carriageway expressway
- A 5 km, 5-lane twin-deck Lagoon Bridge
- Six interchanges
- Dedicated lanes for cyclists, pedestrians, and Bus Rapid Transit (BRT)
The 4MB project was initiated in response to the declining efficiency of the existing 3rd Mainland Bridge in Lagos, which has reached full capacity with an Annual Average Daily Traffic (AADT) of 168,500 to 246,800 as of 2015.
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Advanced Engineering Consultants
Rendel UK
Dar Al-Handasah
Office of Public-Private Partnerships (OPPP)
Ministry of Works and Infrastructure (MoWI)
