if i were to guess it probably has more to do with left hand side driving semantics which as i understand comes from a prevalence of right-handedness and a norm

if i were to guess it probably has more to do with left hand side driving semantics which as i understand comes from a prevalence of right-handedness and a norm of posturing the right hand for weapon use. so, maybe they just adopted the rules of the road, and the legends that come from it.