Been here in Hyderabad (India) for two weeks for business trip and I must say that this is the worst traffic manner I've ever seen among several countries I've visitted or lived in.
I'm really surprised ... no street manner at all! Everyone is rushing and doing zig zag, can't keep on the lane, no sign when turning, even most of the cars don't even have rear mirrors (from the manufacturer)! Even if they do, they are simply tucked in. It gets worse when people just cross the street wherever. And the worst part, everyone sounds the horn! It's sooo noisy.
So, one should come here first before judging that Dubai traffic is the worst.