in the US when meeting another person, the rule is that you go right -- of course, this doesn't always work and the dance ensues -- but generally people tend to walk to the right like they drive right and this makes sidewalks etc somewhat smooth
I cannot figure out the 'rule' if any in Paris -- people seem as likely to veer left as they approach as right -- yet not always
is the 'rule' in Paris go left? or is there no rule? or what is it?