来源：《杭州市萧山区人民政府关于同意建立盈丰街道潮韵社区、奔竞社区及利丰社区的批复》
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Some tags (such as junction=roundabout, highway=motorway and others) imply oneway=yes and therefore the oneway tag is optional. Why you still edit it? It's better to spend your time on other things. Don't waste your time.

Why you change the layer tag! The layer=* tag is one of several methods used to describe vertical relationships between crossing or overlapping features. The vertical ordering established by the layer values is valid exactly only in the precise location (not node) where the ways cross or objects overlap. Are you crazy?