South gate to Angkor Thom

Its the only way to the area Angkor Thom and it means that every body, every vehicle, every bigger animal has to go through this gate.
There is some debate as to the functionality of Angkor Thom as a whole. If it was a wall intended for defense, it was rather poorly designed, since there is nowhere along the wall for defenders to take refuge from incoming fire or shoot back from a shielded location. This is surprising since Angkor had been sacked in 1177 by Champa invaders, and one can readily imagine that its new King, Jayavarman VII would have been concerned with defense should the invaders return.