Sinkholes: What the Evidence Shows
In South Korea, damaged sewer pipes caused 46% of ground collapses between 2019 and 2023. What research shows about natural and urban sinkholes, who pays, and what detection can do.
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Railway Level Crossing Deaths: What the Evidence Shows
US level crossing collisions fell by more than three-quarters between 1981 and 2010, then stopped falling. Gates and lights explain about a fifth of the decline. Who dies at crossings, which kinds are safest, and why the safest kind is not always chosen.
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What a bridge rated ‘poor’ is actually telling you
File photo: a raised bascule bridge on 12th Street in Chicago, in an early-1900s photograph. Photo: Detroit Publishing Company, via Wikimedia Commons, public domain. In the news · September 2026 In early September 2026 the DuSable Lake Shore Drive bridge in Chicago stuck in the raised position for over four hours because heat caused thermal…
