<P> In the late 1700s , traffic in the United States was RHT based on teamsters ' use of large freight wagons pulled by several pairs of horses . The wagons had no driver 's seat , so the ( typically right - handed ) postilion held his whip in his right hand and thus sat on the left rear horse . Seated on the left , the driver preferred that other wagons pass him on the left so that he could be sure to keep clear of the wheels of oncoming wagons . </P>
<P> In the late 1700s , traffic in the United States was RHT based on teamsters ' use of large freight wagons pulled by several pairs of horses . The wagons had no driver 's seat , so the ( typically right - handed ) postilion held his whip in his right hand and thus sat on the left rear horse . Seated on the left , the driver preferred that other wagons pass him on the left so that he could be sure to keep clear of the wheels of oncoming wagons . </P>
does the us drive on the right or left
does the us drive on the right or left
RHT
RHT