GIS-Based Analysis of Public Transport Accessibility in Ogun State Commuter Belt

The Ogun State commuter belt, stretching from Sagamu through Ijebu-Ode to Abeokuta, serves as a significant residential and commercial zone for workers commuting to Lagos and Ibadan, making public transport accessibility a critical quality of life issue. This study conducts a GIS-based analysis of public transport accessibility for residents in the Ogun commuter belt, focusing on bus and road-based transport services. GPS surveys are conducted to map existing bus terminal locations, inter-city and intra-city bus routes, and informal bus stop clusters. Service frequency data are collected through structured field observation over two weekday cycles. Accessibility indices are computed using geographic proximity to bus stops, service frequency weighting, and road network distance to nearest bus terminals. Results indicate that accessibility is concentrated along the Lagos-Ibadan Expressway and the Sagamu-Benin Expressway corridors, with communities located more than two kilometres from these arteries experiencing markedly diminished transport access. Emerging industrial estates in the Sagamu-Interchange and Agbara zones generate significant reverse commute demand that existing bus networks inadequately serve. The study provides spatial evidence to the Ogun State Ministry of Transportation and the state-level commuter transport authority for route planning, terminal siting, and potential public-private partnership structuring. Keywords: public transport, accessibility, GIS, Ogun State, commuter belt.