The Toxicity Characteristic Leaching Procedure (TCLP) leaching of crumb rubber modified asphalt is influenced by several process parameters. Key factors include the rubber content, particle size, and the curing temperature and time. Additionally, the binder type and its viscosity can affect the interaction between the rubber and asphalt matrix. The presence of additives and the pH of the environment also play significant roles in leaching behavior, impacting the release of contaminants.