This research had tried to touch the specific problems of the study area, by taking the specific problems of the area as an objective, it was analyzing the road transport connectivity, Centrality and accessibility of Addis Ababa and towns in OSZ, so as to improve the level of mobility between cities. Therefore the researcher had tried to touch different related literatures and review of books about the road network connectivity, in that way the model or standards of measuring achievements of the objective were sated. The interpreted result was concluded the level of connectivity, centrality and accessibility in the area was poor, therefore it need to be improved. To improve the observed inconvenience of road network in the area, the possible solutions were recommended to the concerned body so as to constructing extra arterial road to the existing road network so as to develop accessibility of road network.