4711, I was thinking of introducing the automotive comparison myself...
Hey Dick, why don't we drive on the right hand side of the road, after all it's gotta be safer, oops, sorry, for the overall benefit of the Australian travelling public.
The US has more vehicular traffic, better roads, harsher weather but let's give it a go. No need for a design safety case and the implementation should be as simple as one, two, three. Certainly now where near the 50 elements of the NAS plan.