Model development of road performance indicator-related travel time using international roughness index: A case study national road network of SulawesiThomas Setiabudi Aden, Hera Widyastuti and Anak Agung Gde KartikaE3S Web Conf., 429 (2023) 03015DOI: https://doi.org/10.1051/e3sconf/202342903015