Using Shredded Waste Tires as a Lightweight Fill Material for Road Subgrades - Summary Report Author(s): Engstrom, Glenn M and Lamb, Rich, MDOT Origin: Minnesota Date: April, 1994 Categories: Performance, Noise Key Words: Waste tires, lightweight fill, subgrade Summary: Waste tires have been a disposal problem in the past and are continuing to accumulate throughout the US today. Using shredded waste tires as a lightweight fill material for road construction has proven to be a beneficial use of this waste product. In general, the material is very elastic, very porous, contains good vibration damping properties, and is easily compacted. On the downside, shredded tires lack set design standard and specifications. The report also documents some of the environmental testing completed on shredded tires to date.