The article makes several good points but I'd have to disagree with the no overtaking rule. Taking the human out of the equation, vis a vis 'IRobot' style, where road travel is managed by computer seems like a more viable option in the long term. There have been several advances in this technology, from MIT especially (Google 'Self driving car', do you really expect me to divert from this tab for you?)

I work in Highway Engineering and Management, the company i work for manages quite a few of the UK's motorways. I wonder if I could wing this point into a meeting. Another Gem HN, thanks.