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A passing lane (North American English) or overtaking lane (British, Irish and Australian English) is the lane on a multi-lane highway or motorway closest to the center of the road (the central reservation). In Californian terminology, the passing lane is often known as the number one lane, left lane, or leftmost lane, due to left hand drive (driving on the right), and the rightmost slow lane is sometimes called the "outside lane", because the lane nearest the center of the roadway is considered "inside". Some regions of the world reverse the definitions of "inside" and "outside", as described under #Regional terminology. In modern traffic planning, passing lanes on freeways are usually designed for through/express traffic, while the outer lanes have entry/exit ramps. However due to routing constraints, some freeways may have ramps exiting from the passing lane; these are known as "left exits" in North America. A passing lane is often colloquially referred to as a fast lane because it is often used for extended periods of time for through traffic or fast traffic. In theory, a passing lane should be used only for passing, thus allowing, even on a road with only two lanes in each direction, motorists to travel at their own pace. ==Regional terminology== The official British Highway Code uses the term right hand lane, due to right hand drive (driving on the left). Unofficially, the overtaking lane is also called the outer or outside lane. The part of the road nearer to the verge (or edge, or hard shoulder) is considered "inside" the other lanes. On a divided highway, the lane nearest to the verge (or hard shoulder) is officially the left hand lane, or unofficially the "inner" or "inside lane". The official Irish Rules of the Road use the term "Lane 1 (also known as the Inner Lane)" for the lane next to the hard shoulder. The overtaking lane is officially Lane 2 (also called "the outside lane") on a two-lane motorway, or Lane 3 on a three-lane motorway. The Australian Road Rules use the terms left lane and right lane. Australia is a right hand drive (driving on the left) country, so the overtaking lane is the right lane, nearer the centre of the road. In other countries, such as Hungary and the United States, the lane nearest to the center of the road is considered "inside". Thus the passing lane is called the inner lane (''belső'' sáv in Hungarian). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「passing lane」の詳細全文を読む スポンサード リンク
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