Technical Memorandum 2001/36

Technical Memorandum 2001/36 provides guidance on applying the "International Roughness Index" (IRI) to evaluate and manage road surface smoothness. It outlines standardized methods for measuring and interpreting roughness levels, helping agencies determine when a road needs maintenance to ensure comfortable and safe driving conditions. The document aims to promote consistent assessment practices across different projects and regions, supporting effective decision-making for road maintenance and improvement.