Left-hand traffic (LHT) and right-hand traffic (RHT) are the practices, in of keeping to the left side or to the right side of the road, respectively. They are fundamental to and are sometimes called a The terms right- and left-hand "drive" refer to the position of the driver and the in the vehicle and are, in automobiles, the reverse of the terms right- and left-hand "traffic". The rule also includes where on the road a vehicle is to be driven, if there is room for more than one vehicle in one direction, and the side on which the vehicle in the rear overtakes the one in the front. For example, a driver in an LHT country would typically overtake on the right of the vehicle being overtaken.