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All-weather running track
An all-weather running track is a rubberized artificial running surface for track and field athletics. It provides a consistent surface for competitors to test their athletic ability unencumbered by adverse weather conditions. Historically, various forms of dirt, grass, sand and crushed cinders were used. Many examples of these varieties of track still exist worldwide.
==Measurement of a track==
The proper length for a competitive running track is . Some tracks are not built to this specification, instead some are legacy to imperial distances like . Prior to rule changes in 1979, distances in Imperial units were still used in the United States. Some facilities build tracks to fit the available space. Olympic tracks in the early 20th century were of other lengths. Each lane of the track could (by IAAF rules should) be as wide as ,〔(【引用サイトリンク】url=http://www.iaaf.org/download/download?filename=77c027b0-46b8-405d-9ffd-889fa28e3f6e.pdf&urlslug=IAAF%20Track%20and%20Field%20Facilities%20Manual%202008%20Edition%20-%20Chapters%201-3 )〕 though the majority of American tracks are built to NFHS high school specifications that allow smaller lanes.〔(【引用サイトリンク】url=http://www.usatf.org/groups/officials/files/resources/rules/2013-NFHS-Rule-Book.pdf )〕 The IAAF also specifies a preferred radius for the turns at 37 metres, but allows a range. Major international level meets are conducted and world records are allowed to be set on tracks that are not exactly 37 metres, but do fall in the range.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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