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The sign was adapted from Swiss usage. The Swiss, in turn, adopted the practice of former European states that marked their boundaries with their formal shields and, when not wishing visitors to enter, would indicate so by tying a blood-red ribbon horizontally around the shield.[citation needed] The sign is also known as C1, from its definition in the Vienna Convention on Road Signs and Signals.A one-way street is a street on which vehicles should only move in one direction. On this type of street a sign is posted showing which direction the vehicles can move in: commonly an upward arrow, or on a T junction where the main road is one-way, an arrow to the left or right. At the end of the street through which vehicles may not enter, a prohibitory traffic sign "Do Not Enter", "Wrong Way", or "No Entry" sign is posted, e.g. with that text, or a round red sign with a white horizontal bar. Sometimes one portion of a street is one-way. another portion two-way. An advantage of one-way streets is that drivers do not have to watch for cars coming in the opposite direction on this type of street. One-way streets may also be part of a one-way system, which facilitates a smoother flow of traffic through, for example, a city centre grid; as in the case of Bangalore, India. This is achieved by arranging one-way streets that cross in such a fashion as to eliminate right turns (for driving on left) or left turns (for driving on right). Traffic light systems at such junctions may be simpler, and may be coordinated to produce a green wave.