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A pedestrian user friendly intelligent crossing (puffin crossing) is a type of pedestrian crossing in use in the United Kingdom. The design is distinct in that the lights controlling the pedestrians are on the near side of the road, rather than on the opposite side as in the older pelican crossing it replaces. The system also utilises sensors which detect the presence of pedestrians waiting at the crossing, and as they are crossing the road. ==Function== Unlike the older pelican crossing designs, where the pedestrian signal lights are mounted on the opposite side of the road, the puffin crossing has them mounted at the near road side, set diagonally to the road edge. This allows the pedestrian to monitor passing traffic while waiting for the signal to cross.〔(Foreword, Puffin Good Practice Guide, Department for Transport, 2006 )〕 A second reason for the design is that having the lights closer to the user assists visually impaired people who could have difficulty viewing the signal from across the carriageway.〔 Some push-button units (the lower box in the picture) are also fitted with a tactile knob under the unit which rotates when the user may cross. This feature is to assist with visually impaired people struggling to see the light change. After a request to cross (by button press) a kerb side detector monitors the pedestrian's presence at the crossing. Should the pedestrian cross prematurely, walk away from the crossing, or wait outside the detection area, the pedestrian's request to cross could be automatically cancelled. This is so traffic is not halted unnecessarily. An on–crossing detector ensures that the signal for vehicles remains red until the pedestrians have finished crossing (within practical limits). Unlike the pelican crossing, there is no transitional "flashing" phase. The pedestrian phase will start at the moment all three of these conditions are fulfilled: * the pedestrian push button has been pressed since the end of the last pedestrian phase * the "Maximum Traffic Green Timer" has expired * the detectors indicate that a pedestrian is still waiting to cross The "Maximum Traffic Green Timer" is started either when the pedestrian push button is pressed or when the traffic signals first turn green after the previous pedestrian phase. The latter arrangement is termed the "pre–timed Maximum Facility".〔 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「Puffin crossing」の詳細全文を読む スポンサード リンク
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