Earlier article by the same author:<p><a href="http:&#x2F;&#x2F;www.wired.com&#x2F;2014&#x2F;09&#x2F;cargo-drones-in-africa&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.wired.com&#x2F;2014&#x2F;09&#x2F;cargo-drones-in-africa&#x2F;</a><p>&quot;The continent’s shortfall on annual public infrastructure spending is $50 billion and rising. There is no money for tunnels and not enough for bridges and bypasses, let alone simple road maintenance. Paving secondary roads is more expensive per kilometer than paving longer arterials and costs have risen sharply in the last decade, with frequent budget overruns of 100 percent or more. Economists have estimated that $1 spent on roads in Africa returns $4 in productivity. How much better value would $1 spent on cargo drone routes be?&quot;