It's really easy to widen the road in a place like India. You just get out the bulldozer and mow down all the slums. Problem solved. Same with China. Just flood the valley and everybody will move.
And how do the bikes and cars co-exist all mingled in the same lane? Honking. Endless honking. Nobody would put up with all that noise here in the West. Nobody would put up with the chaos, either. We like things orderly.