Infrastructure that moves

When our mobile diagnostic truck turned off the tar road into a Limpopo township, the local clinic’s power had been out for two days. Inside the truck, LED panels hummed to life on solar batteries, and a digital mammogram appeared moments later on a radiologist’s screen hundreds of kilometres away. By nightfall, 37 women had been screened, most for the first time in their lives, and two suspicious findings had been flagged for urgent follow-up.

Scenes like this hint at an uncomfortable truth. In many emerging economies, the most sophisticated part of the health system is now mounted on wheels. While we wait for hospitals to be built, infrastructure that moves is quietly doing the work.

The gap that will not close by itself

Across emerging economies, a large share of treatable disease is diagnosed too late. The binding constraint is access to diagnostics rather than a shortage of doctors. Scanners and mammography suites cluster in private hospitals in the cities, leaving vast areas as diagnostic deserts. In South Africa, most public facilities have no on-site mammography at all.

The conventional answer is to build more facilities. Building takes years, needs a stable grid, and costs millions. It also rests on a quiet assumption: that patients can travel. For a woman living three hours from the nearest hospital, the real cost of a mammogram is the transport, the day’s wages lost, and the act of asking permission to be away. The tariff is the smallest part of it.

Meanwhile, health budgets keep flowing towards treatment rather than detection. We fund chemotherapy wards generously and the finding of early disease poorly, then wonder why outcomes lag. We have expensive cures for diseases we still fail to find in time.

Turning the model around

The model I have spent the past few years building treats diagnostics as a service rather than a site. Instead of expecting patients to reach the equipment, the equipment reaches them. Each mobile unit is a self-contained ecosystem: solar power, digital mammography, cloud connectivity, and a route to a radiologist wherever she happens to sit.

The design principle that matters most is modularity. A health planner’s instinct is to build a hub and then add spokes. We invert that. We start with a single node, one truck, and let utilisation data decide where the next one goes. When demand surged near a cluster of factories, a unit moved there within weeks. No construction, no procurement cycle, no sod-turning ceremony. During load-shedding, the units kept working on solar power while fixed clinics around them went dark.

The second principle is to digitise before you scale. It is tempting to think of this work as trucks. We think of it as data. Before the fleet grew, we built the digital spine: encrypted image routing, structured reporting, dashboards that show where screens are happening and how long results take. Radiologists are scarce across Africa; bandwidth is cheap. Pairing careful triage with remote reading lets one urban specialist safely serve communities she will never visit. You should never scale what you cannot measure.

The third principle is to finance in layers. Health funding tends to be binary, public or private. A mobile unit can serve factory workers on weekdays under a corporate wellness contract, screen a township community on weekends under public reimbursement, and contribute anonymised data that helps planners see where disease is being found. Each layer pays for the value it receives, and no single payer carries the whole risk. Access expands without the fiscal deficit doing the same.

Access is a function, not a place

Since our first truck went on the road in 2023, the network has reached more than 300 communities and screened more than 22 000 women, many of whom had never been screened before. The deeper lesson sits underneath the numbers. We tend to speak of access as if it were a place patients must get to. It is better understood as a function the system must perform. When diagnostics move, access follows them.

Emerging economies do not need to copy the hospital-building century that came before. The opportunity is to go straight past it, the way mobile banking went straight past the branch network, towards a system where the first chance to find disease early belongs to everyone, regardless of postcode.

One afternoon outside a township clinic, a woman in her fifties came down the steps of our unit holding her result. Normal. She said the truck had given her peace of mind. For her, the truck was healthcare. For me, it was the whole argument in one sentence.