Why Nations Cannot Stop Building Multi-Billion Dollar Megaprojects That Are Guaranteed to Fail

A version of this article appeared on Highways Today.

The global infrastructure sector has largely learned to live with a problem it cannot seem to solve. Megaprojects, including the massive railways, tunnels, and airports that nations use to cement political credibility, consistently cost more and take longer than initially promised. This is not new information, but there is growing pressure to treat these failures as a solvable systemic issue rather than an unavoidable occupational hazard.

Evidence of this trend has been building for decades, with research by Professor Bent Flyvbjerg showing that overruns are the norm across transport infrastructure globally. This pattern holds even as engineering tools and project management frameworks become more sophisticated. Flyvbjerg and Dan Gardner describe the record as truly depressing for anyone contemplating a big project, as the majority of these developments exceed budget, schedule, or both.

The fallout extends beyond simple accounting. Public finances take the strain, and private investors see returns delayed or diluted. Contractors and supply chains absorb cost pressures that reshape capacity across entire sectors, while future projects are appraised against forecasts that history suggests are systematically too optimistic. This embeds bias into the decision-making process before a single sod is turned on a new site.

Time is a quiet but devastating driver of these overruns. Research indicates a consistent relationship between project duration and cost escalation, where each additional year between approval and operation adds measurable financial exposure. At the scale of major infrastructure, even modest percentage increases represent hundreds of millions in accumulated interest, deferred revenue, and shifting financing conditions that turn delivery windows into significant risks.

The UK’s HS2 rail programme illustrates these pressures, having undergone significant revisions and cancellations over time. Construction activity began before designs had reached sufficient maturity, making expensive changes during delivery inevitable. Reporting systems struggled to provide clear visibility of progress, resulting in a programme that continues to evolve under pressure, with substantial expenditure already committed to elements that will not be delivered as planned.

Saudi Arabia’s NEOM development offers a different lesson regarding scale and ambition. Initially positioned as a transformative development for tourism and industrial growth, the realities of delivery have required significant reassessment. Adjustments to scope, phasing, and investment priorities have followed; this underscores the fact that the scale of change often reflects a failure of rigorous early appraisal and institutional oversight.

Governance sits at the heart of these failures, yet it rarely receives the same attention as engineering or finance. Data from the OECD and IMF suggest that countries lose about 30 percent of the potential returns on infrastructure investments due to systemic inefficiencies. Scope change is where this dysfunction becomes most visible, acting as the most common trigger for construction disputes globally, as the gap between original assumptions and current reality widens.

The industry response is finally changing through phased delivery models like Progressive Design Build in the United States. Methods such as reference class forecasting, which benchmarks projects against similar completed works, are being adopted by institutions like the Inter-American Development Bank. While these approaches do not eliminate risk, they represent a shift toward managing uncertainty through disciplined planning and the flexibility to adapt.