Below is an overview of the types of HIR. The HIR techniques described below provide owner agencies with cost-effective and sustainable methods to repair their aging pavements. HIR is a pavement preservation and corrective maintenance technique that, when combined with an asphalt overlay, can be classified as structural rehabilitation. Note that some specifications described in the following content may not be the same as the specifications followed by your agency. Always check with your State agency’s standards and specifications when using these guidelines.