Which becomes clear when you realize that the anti-vehicle / tank ditches and the directional anti-personal mines ("Selbstschussanlagen") were facing the east d

Which becomes clear when you realize that the anti-vehicle / tank ditches and the directional anti-personal mines ("Selbstschussanlagen") were facing the east direction only[1]. West German tanks and military vehicles could have driven over the ditches without major issues. They only worked one way - from east to west. [1] e.g. https://www.siue.edu/GEOGRAPHY/ONLINE/Vogeler/FortifiedFenced&WalledBorders.htm https://www.siue.edu/GEOGRAPHY/ONLINE/Vogeler/FortifiedFence...