I had heard it was busy and chaotic but it was even more so than I thought.
There is a young man standing in the 'doorway' of the van and he takes the money, when it needs to stop he just waves his arm out at the traffic, no one stops and they don't seem to slow down ..... it is more of a precautionary 'sign' that there are pedestrians on the roadway!
The local people are not in the slightest bit fazed about this form of transport or the way it operates, it is orderly and efficient for them and because of that, it works!
I have also seen red ones. What the difference is (apart from colour) I do not know as they are just as battered as the blue ones!