On Wed, Jan 5, 2011 at 2:49 AM, Alan Mintz
<alan_mintz+...@earthlink.net<alan_mintz%2b...@earthlink.net>
> wrote:

> highway=*_link implies oneway=yes
> junction=roundabout implies oneway=yes
> no layer tag implies layer=0
> no turn restriction at an intersection implies traffic can flow between the
> ways
>
>
You forgot :
no oneway tag implies oneway=no, excepted for roundabouts (statement about
*_link is criticized)
no highway=traffic_signals implies no traffic signals
no maxspeed implies default maxspeed as specified here:
http://wiki.openstreetmap.org/wiki/Relations/Proposed/Defaults
or there:
http://wiki.openstreetmap.org/wiki/OSM_tags_for_routing/Maxspeed
etc
You cannot write "not given Information is simply not yet entered"

Pieren
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