Climate Change and Transportation in Africa Assessing Vulnerability and Adaptation Strategies in Coastal Cities: A Comparative Study of Alexandria, Dakar, Lagos, Mombasa and Durban

Imagine a city where the roads are the veins that carry life, delivering food, medicine, and people to their daily destinations. Now imagine those veins beginning to clog and burst, not from age or neglect, but from the rising tide of a warming planet. This is the reality facing many African coastal cities, where the very infrastructure that holds economies together is increasingly threatened by floods, storm surges, and the slow, creeping rise of the sea. While the entire continent contributes the least to the greenhouse gases causing these changes, its coastal hubs are on the front lines. The challenge is not just about water rising; it is about how that water interacts with the specific geography of each city, how quickly the ground beneath it is sinking, and whether the local systems can handle the deluge. Understanding which roads, bridges, and ports are most at risk, and how different cities are trying to protect them, is essential for keeping these vital connections alive.

A new study brings this complex picture into focus by examining five major coastal cities: Alexandria in Egypt, Dakar in Senegal, Lagos in Nigeria, Mombasa in Kenya, and Durban in South Africa. Researchers set out to measure exactly how vulnerable the transportation networks in these cities are to climate hazards. They looked at the physical damage caused by events like heavy rains and rising seas, and they evaluated the strategies each city has adopted to cope. By combining detailed reviews of government reports, climate data, and records of specific flood events, the team created a way to score and compare the vulnerability of each city. They did not just look at the water itself, but at how that water stops a bus, washes out a railway, or shuts down a port. The goal was to move beyond general warnings and identify exactly where the cracks are forming and which solutions are actually working.

The findings reveal a stark reality: flooding and intense rainfall are the primary enemies of transport in these regions, together accounting for more than two-thirds of the vulnerability across all five cities. When the researchers ranked the cities by their overall risk, Lagos emerged as the most vulnerable, followed closely by Mombasa and Durban. These three cities face a dangerous combination of high exposure to the sea, rapid sinking of the land, and drainage systems that struggle to cope with modern rainfall. In contrast, Dakar and Alexandria showed lower vulnerability scores. This difference is not accidental; the statistical analysis confirmed that the variation between the cities is significant and real. The study suggests that the cities with the highest scores are those where the physical threat is greatest and where the capacity to plan and build defenses is currently more limited.

The story of how each city responds to these threats is as varied as the landscapes they occupy. Alexandria, for instance, has taken a heavy-handed approach, relying on massive concrete barriers and offshore breakwaters to hold back the Mediterranean Sea. It is a strategy of hard engineering, building walls to protect the coastline and the historic city center. Dakar, sitting on a peninsula, is trying a mix of approaches. It is building rock walls to protect its western highway, but it is also designing new train and bus systems with elevated tracks and better drainage to ensure they keep running even when the rains come. Lagos is fighting a different battle, combining massive land-reclamation projects that push back the ocean with efforts to upgrade its clogged drainage systems and restore mangrove forests that act as natural buffers.

Mombasa is focused on keeping its port, a critical hub for East Africa, operational. The city is investing in raising the berths where ships dock and building a new bypass road to provide a safe route when the coastal highway is washed away. Durban offers a different kind of lesson. After devastating floods in 2022, the city rebuilt its roads and bridges to withstand even worse storms, but it also leaned heavily on its community. By partnering with local universities and residents, Durban created a system where people receive flood warnings directly on their phones, allowing them to move to safety before the water rises. This community-based early warning system has already been credited with saving lives.

The study makes it clear that there is no single solution that fits all. While hard walls work in some places, nature-based solutions like restoring wetlands work in others, and community alerts are vital everywhere. The researchers found that the most effective approach is a combination of physical protection, smarter design for new infrastructure, and strong local response systems. However, they also noted that money and planning remain the biggest hurdles. Many cities have good policies on paper, but the funds to maintain the drainage systems and repair the seawalls are often missing. Without a steady stream of funding for upkeep, even the best-adapted roads will eventually fail.

Looking ahead, the authors suggest that these cities need more than just local fixes; they need global support and regional cooperation. They argue that the nations responsible for the majority of global emissions should provide a proportionate share of the funding needed to protect these vulnerable hubs. They also recommend that cities share their successes and failures, perhaps adopting Durban's community warning model for other coastal towns. Ultimately, the study concludes that keeping African coastal cities moving in a changing climate will require a blend of engineering, ecology, and community action, all backed by reliable financing. The roads, bridges, and ports are the arteries of these economies, and ensuring they remain open is not just a matter of convenience, but of survival.