Since 1978, Caltrans has used recycled tire rubber in 17 asphalt overlays; a technical review found less cracking, distress and maintenance than conventional mixtures, including thicker ones

In the United States, an astounding 273 million tires are discarded every year, resulting in a considerable amount of waste. To address this issue, California has implemented rubberized asphalt in road construction since 1978. This approach has had mixed outcomes across different states, with some projects failing to justify the increased costs.