Evaluating the Effectiveness of Public-Private Partnerships (PPPS) In Enhancing Construction Work: A case study of the Lusaka-Ndola Dual Carriageway Project

Public-Private Partnerships (PPPs) are increasingly being used to improve infrastructure delivery in poor nations, with the prospect of increased cost efficiency, faster timeframes, higher building quality, and risk-sharing innovations. The transformation of Zambia's Lusaka-Ndola Dual Carriageway into a PPP provided a strategic opportunity to evaluate these assertions in the context of local fiscal constraints and governance issues. The purpose of this study was to assess the success of PPPs in Zambia's road sector through mixed-methods research, which included thematic analysis of qualitative data and multiple regression modelling of survey responses from 120 participants representing the government, private sector, and road user groups. The results showed a 52% reduction in per-kilometer cost via PPP compared to traditional procurement, as well as a projected 23% reduction in delivery time and a 23% improvement in construction quality measures, including pavement compliance. However, institutional coordination received the lowest rating, with fragmentation and insufficient enforcement noted as limiting issues. The study shows that, while PPPs can result in significant efficiency and quality increases, these advantages are limited by systemic governance flaws. To fully realize the potential of PPPs in Zambia, it advises boosting transparency measures, reducing bureaucratic processes, implementing international quality standards, and improving institutional capacity through cross-agency collaboration and stakeholder engagement.