2009/12/1 Frederik Ramm <[email protected]> > And then both axes are not really "boolean". Between the physically > possible and the physically impossible may lie an area that requires > more skill, better vehicles or simply means a higher risk of accidents. >
amenity=footway, surface=wire, risk=very_high? http://staalplaat.files.wordpress.com/2009/08/philippe-petit-wtc-tightrope2.jpg cheers, Martin
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