ABSTRACT

Damaged road conditions can reduce the comfort and safety levels of road users, necessitating periodic evaluations of pavement performance. This study aims to analyze the road distress conditions on the Teratai–Japan road segment in Mojokerto Regency, spanning 1.6 km with a combined pavement type consisting of both rigid and flexible pavements. The research methods employed include field surveys, road surface roughness measurements to obtain the International Roughness Index (IRI) values, and visual observations of surface distress to determine the Surface Distress Index (SDI) values. The results show that the highest e-IRI value of 9.8 and the highest SDI value of 117.5 were found at STA 0+400–0+500, categorized as slightly damaged road condition. The analysis of the relationship between IRI and SDI values indicates that an increase in IRI values tends to be followed by an increase in SDI values, with a correlation coefficient of 0.93, representing a very strong correlation. Generally, the condition of the Teratai–Japan road segment falls within the moderate to slightly damaged category, requiring maintenance interventions to improve road service levels. This research provides a novel contribution in the use of IRI and SDI to identify road conditions more accurately and provide robust data-based recommendations for road improvements..