Experimental study on scour at unpaved road shoulder Wahyu Widiyanto, Litan Dey, Sanidhya Nika Purnomo, Purwanto Bekti Santoso and Srigunawan Sugiharto MATEC Web Conf., 402 (2024) 04003 Published online: 23 August 2024 DOI: 10.1051/matecconf/202440204003