Slope Risk Management System on Toll Road: A case study Semarang-Salatiga Section Ferry Hermawan, Malik Maulana, Ismiyati, Himawan Indarto and Goji Pamungkas E3S Web Conf., 448 (2023) 01012 Published online: 17 November 2023 DOI: 10.1051/e3sconf/202344801012