I am interested to discover the connection between the tags of highways and the instructions one receives using OSM for navigation. I experienced a situation yesterday when I was informed to take a slip road before reaching a roundabout; the approach and departure sections merely split (http://www.openstreetmap.org/#map=18/51.30122/-1.04263). Is it the tags alone (such as oneway=yes, perhaps, in this case) that dictate how navigation software interprets them? I should like to know for editing purposes.
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