Interesting that across the pond, they are looking for reasonable solutions to add safety, and that the non-certified position solutions tested performed as well, and in some cases, better than the spendy position solutions. (If I am misreading this, let me know)
We, in contrast, turn off traffic to to NPE's to enhance "safety" and drive compliance. (I'll admit I don't have all the details here, but some acronym organizations seem to agree)
Just sayin'.........
Linky here