International Roughness Index for paved ABC roads

Traffic map

International Roughness Index (IRI) was collected for the entire road network. Some of the roads are in such bad condition that the minimum speed of 20 km/h for IRI measurements were not reached. IRI can be used as a Key Performance Indicator for road condition. It should be separated for paved and unpaved roads. Average IRI for paved A -roads is 4.4 mm/m, for paved B -roads the average IRI is 6.7 mm/m and for paved C -roads 8.7 mm/m.