Abstract
The International Roughness Index (IRI) or the international index of road roughness is an international index that shows the roughness of the road surface in units of m/km. The IRI score measurement is divided into 4 (four) classes, namely class 1 (one), class 2 (two), class 3 (three) and class 4 (four). The IRI value measurement in West Kalimantan Province in 2020 uses one of the class 3 (three) methods, namely the IRImeter 2 measuring tool. The IRImeter 2 tool is an automatic measurement system used in the road construction industry to measure, verify and map the road roughness index (IRI) with multiple surfaces consisting of an IRI sensor, block control, GPS antenna, USB cable and lighter socket. This study has the objective of analyzing and evaluating the International Roughness Index (IRI) on the 2020 Damage Level Value for the National Road Section of West Kalimantan Province. The method used in this research is calculating the IRI Average value, grouping the types of damage per segment based on the IRI value , calculating the stability value and handling based on the type or level of damage. The calculation results show that of the total length of 2153.16 km of national roads in West Kalimantan Province, 1222.13 km or 57% are in good condition, 777.28 km or 36% are in moderate condition, 68.15 km or 3.17% are in good condition. slightly damaged and 85.60 km or 3.98% in a heavily damaged condition. The level of stability level of the national road section of West Kalimantan Province is 1999.41 km or 92.86% in steady state and 153.75 or 7.14% in unsteady conditions.
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