In 1300,some say that Pope Boniface ordered pilgrims on the way to St.Peter's Basilica to stay to the when they crossed a nearby bridge.Another idea is that in the 1700s,people in France and in the United stats started to use wagons with several pairs of horses and to drives to sot on the right side of the road.It was easier for the drives to sit on the left and control the horses with a whip in the right hand,and it was safer it other vehicles. Some people say that in England,people always drove on the left and in France,people always drove on the right.