This market consumed 1020 thousand tons of scrap tires, or over 25 percent of the volume of scrap tires generated. Ground rubber is produced by grinding scrap tires into size defined pieces. Ground rubber applications include new rubber products, playground and other sports surfacing and rubber-modified asphalt. Ground rubber also includes larger pieces of rubber used as landscaping mulch, and loose fill playground material. The playground and mulch market was the most dynamic segment in the ground rubber market during this period. The asphalt market uses ground rubber to modify the asphalt binder used in road paving, resulting in quieter, more durable roads.