WW2 Tank Trap

Tank Trap are fortifications of reinforced steel first used during the Second World War to impede the movement of tanks and mechanised infantry. The idea was to slow down and channel tanks into "killing zones" where they could easily be disposed of by anti-tank weapons.
They were employed extensively, particularly on the Siegfried Line.
In practice, the use of combat engineers and specialist clearance vehicles enabled them to be disposed of relatively quickly, and they proved far less of an obstacle than many had expected.