I just got back from a cruise where I took a taxi tour while on St Thomas Island. There were few general traffic controls, few light controlled intersections (can't really remember one), lots of traffic and low capacity roads. An intersection would sometimes have four streams of traffic meeting at one point with the drivers doing various actions (straight, right turn, left turn, etc.).
However, the drivers were patient and cooperative. In spite of the traffic, and the apparent chaos, people worked with each other, let others pass in front even if it delayed their progress 10 -20 seconds, and when all was said and done it moved very well. What would have been gridlocked choke points full of selfish, impatient fuming drivers here was a minor inconvienience there.
Charon