However, most attempts were without success. Last of patents expired in 1992. Many state highway departments prefer to use old materials and methods. RPA does not support mandates. A-R should be used by free choice based on its superior qualities.
Some specialized equipment is required.
It depends on the mix design specified. About ten million tires are recycled each year in paving applications. The cost has decreased substantially since the patents have expired. The cost is nearly half of what it was in 1985. The Cost Savings comes from the long life cycle, decreased maintenance, and use of less material.