RizkiM. “edesign of ore royne sing atural aterials”. JTI nternational ournal of ransportation and nfrastructure ISSN 2597-4769 ISSN 2597-4734, ol. 3, no. 1, July 2020, pp. 51-60, doi:10.29138/ijti.v3i1.1056.