It is a lower cost construction technique, to just stand up the panels, and set them in the concrete foundation, without first joining them together (like welding). It is especially easier on sloping/uneven terrain.
One of the prototypes built last year, is a super-bollard design. Very heavy steel with anti-corrosion treatment, in a very solid foundation, joined for a continuously smooth no-grip, extra-large anti-climb barrel top. It was the most expensive design of the eight.
30 Feet tall. Just forget about climbing over this monster.
