In 2000, California packed 662,700 shredded waste tires beneath an I-880 on-ramp; they cut foundation stress 40%, saved $477,000, and CalRecycle later reported 22 years without repairs or issues
Engineers working to upgrade a busy highway junction near San Francisco in 2000 faced a serious technical problem. The ground was made up of about 30 feet of unstable bay mud, a soft type of soil that could sink or crack under the weight of normal road-building materials. To solve the problem, project planners used…