Poor or very poor road surface

The share of state road surfaces that is classified as poor or very poor based on measurements of furrows (crosswise evenness) and lengthwise evenness (International Roughness Index &– IRI) on solid road surfaces. Poor road surfaces have a furrow depth of 18-24 mm or an IRI of 3.1-4.4 mm/m. Very poor road surfaces have a furrow depth of more than 24 mm or an IRI of more than 4.4 mm/m.