WHY UNDERGROUND METRO IS BETTER THAN ELEVATED METRO. International Journal of Advance Engineering and Research Development (IJAERD), [S. l.], v. 5, n. 3, p. 1604–1607, 2018. Disponível em: https://www.ijaerd.org/index.php/IJAERD/article/view/5504. Acesso em: 6 aug. 2025.