In 1999, Missouri drove recycled-plastic pins into a failing I-70 slope; the site remained stable after four years, and the method cost 25% less than conventional repairs

Back in 1999, engineers turned to an eco-friendly solution by inserting over three thousand recycled plastic pins into a hillslope along Interstate 70 in Emma to combat landslides. This innovative strategy not only stabilized the slope but also cut costs by 25%. Following its success, similar techniques have been adopted in states like Iowa and Texas, although environmental concerns regarding the plastic pins' longevity persist.