The fundamental differences here were demonstrated to me recently. On the new Perth to Bunbury highway, a major intersection was built, no doubt using all the appropriate risk-management and design principles ie "world's best practice". It was, in my view, a very easy intersection to negotiate from all directions.
However, serious accidents quickly started occurring at this intersection, probably causing some gnashing of designer's teeth. The result? The speed limit was in one direction on the highway was quickly reduced from 110kph to 80kph. No doubt there were some "Dick Smiths" on the road who said "WTF are we doing 80?! bla bla bla". The rest of us said "fair enough".
That's what we're saying to you, Ledsled and fellow Nastronauts. There's a problem, regardless of what your studies show, and for you to ignore it when there is no major benefit to be lost by implementing C instead of E, you will be negligent. But then again, as has been said before, you're not signing the paperwork, are you?