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<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>So we now have relationships to play with, which is
just great. Now we need to decide how to use them before we encode lots of
data, and before people start coding journey planners.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>Currently we have a proposal of ‘turn_restriction’.
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><a
href="http://wiki.openstreetmap.org/index.php/Relationships">http://wiki.openstreetmap.org/index.php/Relationships</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>IMHO, I don’t think the word ‘turn’
is correct, because we might be talking about something that is straight-on, so
the phase ‘manoeuvre’ is actually the more appropriate Engish term (or
actually probably the better French term that has now been appropriated by the
English from the spelling). Also, the term restricted is not quite right. See
below for how the other standards use the phrase.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>If one looks at other standards, such as GDF (<a
href="http://www.ertico.com/en/links/links/gdf_-_geographic_data_files.htm">http://www.ertico.com/en/links/links/gdf_-_geographic_data_files.htm</a>)
or the equivalent from the Ordnance Survey (<a
href="http://www.ordnancesurvey.co.uk/oswebsite/products/osmastermap/userguides/docs/OSMM_ITN_userguide_v1.0.pdf">http://www.ordnancesurvey.co.uk/oswebsite/products/osmastermap/userguides/docs/OSMM_ITN_userguide_v1.0.pdf</a>)
one finds that they tease out other important different sorts of manoeuvre. There
is also consistent terminology between these standards (and GDF is now an ISO
standard).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>In these documents they identify the following routing
limitations.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>1) Prohibited_manoeuvre ; one that there is a not
legal, but might be physically possible (GDF and ITN).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>2) Restricted_manoeuvre ; that that it is not impossible
to make (often for identified classes of vehicle) (GDF and ITN)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>3) Priority_manoeuvre ; one that does not need to be
announced as you are following the same road. (GDF and ITN)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>4) mandatory_manoeuvre ; one that you must make. (ITN
only)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>5) Finally, there is also a special type of
prohibited manoeuvre with ‘no U turn’ for dual carriageways. The
actual encoding of the prohibition includes three ways, the one on the initial
dual carriageway, the short stub across the carriageway and then the link on
the other carriageway coming back again. For this we would need to have three
associated ways ‘from’ ‘via’ and ‘to’. (ITN
only)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>For all of these above types, they can be restricted
by time and by vehicle class.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>I propose that we use the above phases as appropriate
in place of ‘turn_restriction’ and keep the ‘roles’ as
described in the proposal.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>If anyone is interested, there is a comparison
between GDF and OSM here:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><a href="http://wiki.openstreetmap.org/index.php/GDF">http://wiki.openstreetmap.org/index.php/GDF</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'>PeterIto<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span lang=EN-GB style='font-size:
10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=4 face=Arial><span lang=EN-GB><o:p> </o:p></span></font></p>
<p class=MsoBodyText><font size=1 face=Tahoma><span lang=EN-GB
style='font-size:9.0pt;line-height:120%'><o:p> </o:p></span></font></p>
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