The Resilience of South African Road Infrastructure to Floods

Abstract

Natural hazards pose a persistent threat to the world's transport infrastructure, which serves as the backbone of every country's economic prosperity. Reliable transportation networks are essential for the smooth movement of goods, services, and people, thus directly influencing economic growth and development. However, in recent years, extreme weather events --particularly floods -- have caused significant damage to transport systems, leading to substantial economic losses, disruptions in supply chains, and decreased mobility. In light of these challenges, it has become increasingly clear that building a more resilient transportation system is not just necessary, but also urgent. Cities and regions that fail to strengthen their transport infrastructure risk severe economic setbacks and social disruptions.

A resilient transportation network must be designed to withstand and quickly recover from the impacts of disasters, ensuring continuity in mobility and economic activities. Thus, transportation infrastructure must be adaptive, robust, and capable of withstanding future hazards. Investing in resilient transport systems through better planning, innovative engineering solutions, and climate-adaptive policies will be critical in safeguarding economies and communities from the growing risks posed by disasters.

This study aimed to gain insights into the resilience of South African road transport infrastructure (RTI) to floods. To achieve this aim, both theoretical and empirical approaches were employed. Initially, a literature review was conducted to develop a theoretical understanding of resilience concerning road transport infrastructure and conceptualise floods and their impacts on this infrastructure. Secondly, officials' (SANRAL, Department of Transport, CSIR, South African Road Federation and private consulting companies) perspectives regarding road transport infrastructure resilience in South Africa were sought. The study employed a resilience model based on the R4 framework, which encompasses Robustness, Redundancy, Resourcefulness, and Rapidity, to evaluate the resilience of the country's road transport infrastructure from the officials' viewpoint.

To effectively address the objectives, a mixed-methods research design was adopted, which allows for comprehensive exploration of individual perspectives while ensuring reliability and precision. Data for the empirical study was collected through semi-structured, face-to-face interviews, facilitating thematic analysis of the information gathered. The insights derived from this phase led to the development of instruments for the quantitative component of the study, which utilised an online survey to gather data. A total of 25 practitioners from transport infrastructure institutions participated in the research.

The participants articulated the importance of ensuring the resilience of the transport system to floods and also identified factors such as political interference, negligence, lack of accountability, and insufficient funding, which hindered the implementation of resilience programmes. The empirical findings also revealed that only road redundancy is fully functional, whereas road rapidity, robustness, and resourcefulness are inadequate. In addition, the findings point out that road rapidity and redundancy depend on the availability of resources. Thus, resourcefulness plays a significant role in achieving RTI's resilience. Meanwhile, participants recommended the appointment of zealous leaders, restricting political intervention, availability of finance, and granting full authority to engineers to enhance road resilience. Through an evaluation of the resilience of South African road infrastructure to floods, this study contributes significantly to highlighting the importance of road transport infrastructure's resilience in South Africa.