I think james was inspired by these when he did the new signals for experimental. The difference is that he rendered them in blender instead of my pixel-art. Another difference is that he used the different desings solely for different eras, while there are 3 visually identical signs for different speeds at the same time. I would prefer using the older designs for lower speed, and newer design for higher speed limits.
Anyway, if you like them, feel free to use them in any way.