Over the new year, on our family holiday, we took a few days out in Siem Reap and I was very surprised to see how different the cycling scene was there verses our trip to Tanzania last year. Whereas in Africa, where most poor people were walking and some people had access to bicycles and even fewer to motorised transport, in Cambodia our impression was that even a lot of the poor have access to a motorised bike of some sort. Fewer people then were on bicycles and seemingly even fewer actually walk. Motorbikes/scooters were everywhere. The congestion and pollution...