Along a quiet stretch of road in Maine, engineers buried something most people would expect to see in a scrapyard rather than beneath their tyres: about 20,000 discarded car tyres. The unusual experiment was designed to tackle two problems at once.

Discover how engineers in Maine are transforming 1 million scrap tires annually into lightweight fill for highway embankments, stabilizing weak marine clay and saving costs.

Along a quiet stretch of road in Maine, engineers buried something most people would expect to see in a scrapyard rather than beneath their tyres: about 20,000 discarded car…