![]() In LHT, traffic keeps left and cars usually have the steering wheel on the right (RHD: right-hand drive) and roundabouts circulate clockwise. Historical switches of traffic handedness have often been motivated by factors such as changes in political administration, a desire for uniformity within a country or with neighboring states, or availability and affordability of vehicles. Most of the countries that were part of the French colonial empire adopted RHT. Many of the countries using LHT were part of the British Empire, while others, including Indonesia, Japan, Nepal, Bhutan, Macao, Thailand, Mozambique, Suriname, Sweden and Iceland (which use RHT since September 1967 and late May 1968 respectively), were not. Between 19, 34 of the LHT territories switched to RHT. In 1919, 104 of the world's territories were LHT and an equal number were RHT. RHT is used in 165 countries and territories, mainly in the Americas, Continental Europe, northern Africa and mainland Asia (except South Asia), while 75 countries use LHT, which account for about a sixth of the world's land area, a quarter of its roads, and about a third of its population. For example, a driver in an LHT country would typically overtake on the right of the vehicle being overtaken. The rule also includes where on the road a vehicle is to be driven, if there is room for more than one vehicle in the one direction, and the side on which the vehicle in the rear overtakes the one in the front. The terms right- and left-hand drive refer to the position of the driver and the steering wheel in the vehicle and are, in automobiles, the reverse of the terms right- and left-hand traffic. They are fundamental to traffic flow, and are sometimes called the rule of the road. The driver shall then make the turn consistent with any traffic markers, buttons, or signs, yielding the right-of-way to any vehicles or bicycles approaching so close thereto as to constitute an immediate hazard.Left-hand traffic ( LHT) and right-hand traffic ( RHT) are the practices, in bidirectional traffic, of keeping to the left side and to the right side of the road, respectively. (g) Whenever it is necessary for the driver of a motor vehicle to cross a bicycle lane adjacent to the driver's lane of travel to make a turn, the driver shall first signal the movement, then drive the motor vehicle into the bicycle lane prior to making the turn, but only after it is safe to do so. (f) Local authorities in their respective jurisdictions may cause markers, buttons, or signs to be placed within or adjacent to intersections and thereby require and direct that a different course from that specified in this section be traveled by vehicles turning at an intersection, and when markers, buttons, or signs are so placed no driver of a vehicle shall turn a vehicle at an intersection other than as directed and required by such markers, buttons, or signs. (e) Where both streets or roadways are one way, both the approach for a left turn and a left turn shall be made as close as practicable to the left-hand curb or edge of the roadway. (d) A left turn from a one-way roadway into a two-way roadway shall be made from the left-hand lane and by passing to the right of the centerline of the roadway being entered upon leaving the intersection. (c) Approach for a left turn from a two-way roadway into a one-way roadway shall be made in that portion of the right half of the roadway nearest the centerline thereof and by passing to the right of such centerline where it enters the intersection. Whenever practicable the left turn shall be made in that portion of the intersection to the left of the center of the intersection. (b) Approach for a left turn on other than one-way roadways shall be made in that portion of the right half of the roadway nearest the centerline thereof, and after entering the intersection the left turn shall be made so as to leave the intersection to the right of the centerline of the roadway being entered. When necessary to accommodate vehicle configuration, a driver is permitted to make a right turn into the farthest lane of a roadway with two or more lanes in the same direction in order to make a U-turn at a reduced conflict intersection, if it is safe to do so. (a) Except as otherwise provided in this paragraph, both the approach for a right turn and a right turn shall be made as close as practicable to the right-hand curb or edge of the roadway. The driver of a vehicle intending to turn at an intersection shall do so as follows:
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