Observed proportion of helmet use and safe passing manoeuvres from Walker (2007).
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https://figshare.com/articles/dataset/_Observed_proportion_of_helmet_use_and_safe_passing_manoeuvres_from_Walker_2007_/667073
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资源简介：
Observed proportion of helmet use and safe passing manoeuvres from Walker (2007).
创建时间：
2016-10-31
