Public transport is one of the social facilities which are provided with the aim of improving social welfare. However providing equitable and efficient public transport for the ever increasing demand with the limited resource available is a challenge in the developing world. Thus the need to evaluate current public transport efficiency to identify opportunities and deficiencies as the cost of maintaining, expanding and extending public transport service is very high and mostly unaffordable for developing countries. Efficiency measures compare realized and optimal levels of outputs and inputs. In public transport, efficiency measures can be used to monitor resource and service distributions, identify deficiencies and opportunities. This research investigates Anbessa city bus transport service efficiency and bus route network deficiencies, aiming for equitable bus service to all groups of society in Addis Ababa, the capital city of Ethiopia. In Addis Ababa city bus service is run by a sole company called ‘Anbessa’. Addis Ababa is a home city for more than 3.5million inhabitants.