why must you drive on tha right side of the road in some countries and on the left side of the road in other countries?
Investigate the question, and you find a lot of confusion on right versus left.About a quarter of the world drives on the left, and most of those contries used to be British colonies, In England, people drive on the left,but on escalators, they stand on the right,so that people who are in a hurry can go up on the left. In Japan, they drive on the left,too,but people usually standon the left on escalators