Which side of the sidewalk do you walk on?

I kept running into people while walking on the sidewalk. Is there a correct side Thais supposed to walk on?

Should it be left side as driving? Or right side as an old Thai saying ‘right for humans, left for dogs’?

Extra questions:

1. Which side do you stand and which side do you walk on an escalator when you go to a mall?
2. Stair (i.e. pedestrian bridge). Left side or right side?

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