This is turning into yet another local culture bashing thread.
I rarely catch buses, but when I have asked for help it usually goes fine. But then, I tend to pick people who look like they are likely to be helpful- ideally, the guys who man bus booths, otherwise people who look 'approachable', i.e. relaxed, not carrying bags, perhaps a couple (safety in numbers and the male can demonstrate his knowledge/helpfulness in front of his partner). Or I ask in a shop where I've already had some interaction with the staff.
If people are litterally running away, this suggest more that the OP is either asking the wrong people, or he comes across as a tad scary.