Category: Department OrderSub Category: construction-materialsSeries: 2015No: 47Superseded by: DO_137_s2016File: DO_047_S2015.pdfDate: Thursday, March 19, 2015Superseded Link: /sites/default/files/issuances/DO_137_s2016.pdfTags: Adoption International Roughness Index Valuesl National Primary Roads IRI materials BQS 047Bureaus and Services: Bureau of Quality and Safety