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CTC off-road trail grades : ウィキペディア英語版 | CTC off-road trail grades
A grading system for way-marked off-road cycling trails has been adopted in the UK, and is used by official bodies such as the Forestry Commission and IMBA-UK. It was originally developed by Cyclists' Touring Club (CTC) employee Colin Palmer in June 1999, based on a system widely used for grading cross-country skiing routes. A solitary major hazard (e.g. one steep hill or a difficult junction) will not necessarily raise an otherwise 'Easy' route into a 'Difficult' one. ==UK Trails by Grade==
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「CTC off-road trail grades」の詳細全文を読む
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