Patterns of nodal accessibility on influence of cost and time in Delta State, Nigeria (1976-2016)

Abstract

The central aim of this study is to examine the patterns of nodal accessibility on influence of cost and time in Delta State, Nigeria. To be able to do this, the development of the transport network is first traced from 1976 to 2016. The data collected for the period between 1976 and 2016, were based on government documents. A classification of 50 sampled settlements, called centres, is first developed based on population size by means of graph theory. The complex network of roads is abstracted into set of nodes and edges. These nodes were subsequently weighted according to their number and functions. It is however, observed that there is some relationship between travel time and cost factors and distances; and high speed is observed to be concentrated within a given distance band (about 20.3km). Based on the findings, recommendations that would enhance equitable transport development in the study area include: constructing new roads that will increase accessibility, save time and reduce cost of other centres and relocation of some facilities.