Thanks for your well-written and timely article. I had no idea that such a low percentage of CDM projects were in transport - this leaves much to be desired!
I have one comment. You note that implementing Stern's high carbon price would increase gas prices by $0.70 and you suggest this would not be enough to change mobility patterns. A survey of 1000 Americans conducted shortly after gas price rises in 2008 (http://www.ipsos-na.com/news-polls/pressrelease.aspx?id=3953) suggests that $0.70 would be sufficient to change habits.
Regardless, it seems as if we need low-carbon transport across the globe and policies should be put in place sooner rather than later in non-OECD countries with high transport growth rates.