Encore Tire Recovery of Livonia, MI, debuted a mobile tire-shredding vehicle that has the capacity to shred tires at the rate of 500 tires per hour. Vehicle tires present one of the thornier problems in recycling. The U.S. alone has already produced 280 million scrap tires and they’re not easy to recycle. When buried in landfill, they work their way to the surface. They’re also a fire hazard. Many states have enacted laws requiring tire retailers to ensure proper disposal of used tires. Once shredded, tires can be used as playground and landscaping mulch, asphalt and athletic track surfaces.