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Pigtail Auto Loops
Wednesday, 10th August 2011 by Tom Howder
Routes can curve so completely that sometimes they loop all the way around and cross over themselves at a different elevation. Generally this happens in mountainous areas or in tightly-confined urban areas where there isn’t enough space to create a reasonable grade with a straightaway. This simple but dizzying solution goes by several names including spiral, loop and pigtail. I’m partial to pigtail simply for its whimsical imagery, of paths…
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