investigate the question,and you find a lot of confusion on right versus left.
About a quarter of the world drives on left,and most of those countries used to be British colonies.In England,people drive on 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 stand on the left on escalators.
There are different explanation for the use of right versus left. Some people believe that it is a natural tendency to walk or drive on the right.This is because most people are right-handed.
We can look back in history for reasons people movie on the right or left of the road.Some people say that in Europe hundreds years ago people rode their horses on the left.