The recent MAP-21, FHWA’s Notice of Proposed Rule Makings (NPRM) have heightened the importance of IRI as one of the performance metrics on pavement conditions that is required in the state DOT’s asset management plan. Why would FHWA pick IRI? For one important reason – this is by far the only national-level data that the state DOTs collect and submit every year for Highway Performance Monitoring System (HPMS) reporting. Many state DOTs have IRI data since 1990 when it was first required by FHWA. So it is reasonable to see why the IRI became one of the performance metrics proposed, and state DOTs will be required to set a target in their asset management plan.