The “old wall” is the equivalent of “no wall.” Ineffective. The PSP (Marston Mat) works fine for landing helicopters on. But was not designed to be placed in an upright position and used as a “fence.” Chain link? Bolt cutters render it useless. Fence pliers, etc. Thus, the “new wall” will be just the barrier we need. From sea to shining sea.
Cat got your tongue Taipei?