In reply to DaveHK:
Those aren't safety barriers. They are advertising hoardings that appear designed to maim and injure.
Absolutely shocking that they have no structural integrity. Straw bales would be better - at least they aren't metal with pointy edges.
Like barriers at car events, they should be designed to safely contain a competitor and let them slide along (and not bounce back if possible). This shouldn't be beyond the wit of man, or particularly expensive, nor any more time consuming to set up