Abstract
Transportation is a sector which plays an important role in the process of development of countries around the world. A crucial step in transportation planning process is the measure of the efficiency of transportation systems in order to guarantee the desired service. This paper investigates the relative efficiencies of lines of the main public transportation company Dakar Dem Dikk (DDD)\footnote{\textit{Dem Dikk} meaning \guillemotleft Go-Return\guillemotright} in Dakar (Senegal). The objective is to apply Data Envelopment Analysis (DEA) and bootstrapping approaches in order to identify opportunities for improvement. In this study, we examine technical efficiency for the 24 lines of DDD using Constant Returns to Scale (CRS) and Variable Returns to Scale (VRS) DEA output oriented models. We apply bootstrap approach for bias correction and for confidence intervals creation of our estimates. Finally, we examine the returns to scale characterization of lines. The results establish that there exist possibilities for improvement for the lines and also shown that there are potential for restructure for some lines.
Highlights
Throughout history, transport has been the backbone of economic growth worldwide
Fifteen (15) lines of Dakar Dem Dikk (DDD) company are operating under Increasing Returns to Scale (IRS), one line operate under Decreasing Returns to Scale (DRS) and eight (8) lines only operate under Constant Returns to Scale (CRS)
We have developed a Data Envelopment Analysis (DEA) and bootstrapping methods for investigating line efficiencies of DDD company
Summary
The ability to improve performance every time and the capacity to serve people through shared passenger infrastructures are among the key factors for building effective transport systems (Swift, 2014) With respect to such a framework, public transportation appears as the most important component, especially in large cities of developing countries, like Dakar, the capital of Senegal. In order to provide a satisfactory service level for the population, DDD company must abide to standard conformity guidelines (including safety, reliability, cleanness, regularity, availability, timetable (scheduling), etc.) and respect their budgetary commitments The importance of the latter requirements is stressed with the creation in 2014 of a new unit, PPSE (Pôle Pilotage et Suivi Evaluation), whose role is monitoring the activities of DEX (Direction de l’EXploitation)..
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