<br><br><div class="gmail_quote">On Thu, Apr 23, 2009 at 14:45, David Lynch <span dir="ltr"><<a href="mailto:djlynch@gmail.com">djlynch@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im">On Thu, Apr 23, 2009 at 14:25, SteveC <<a href="mailto:steve@asklater.com" target="_blank">steve@asklater.com</a>> wrote:<br>>> If both from and to ways continue after the via point and neither is<br>
>> one-way, there's two possible ways to interpret it: the restriction<br>
>> could apply when coming from either of the ends of the from-way.<br>>> This of course doesn't matter if there is similar restriction coming<br>>> from both directions, but that's not nearly always the case. And<br>
>> even if there is symmetry in the real life restrictions, it's not<br>>> appropriate in my opinion to map those with just one restriction.<br>><br>> eh? don't you assign direction by saying 'from' and 'to' ?<br>
><br><br></div>To use a bit of ASCII art: (best viewed in monospace font)<br><br><font face="courier new,monospace"> (1)<br> |<br> B<br> |</font><br><font style="font-family: courier new,monospace;" face="courier new,monospace">(2)--A--</font><span style="font-family: courier new,monospace;">(3)--A--(4</span>)<br>
<span style="font-family: courier new,monospace;"> |<br> B<br> |<br> (5)<br><br></span>A turn restriction from way A onto way B via node 3 of "no left turn" doesn't specify whether the left turn is from Node 2 towards Node 1, from Node 4 towards Node 5, or both. <br>
<br>IMO, adding a "from_node" role for the last node before the intersection and a "to_node" for the first node after the intersection would be the way to get rid of the ambiguity without requiring a lot of splitting.<span style="font-family: courier new,monospace;"><br>
</span><br>-- <br>David J. Lynch<br><a href="mailto:djlynch@gmail.com" target="_blank">djlynch@gmail.com</a><br><br>
</blockquote></div><br><br clear="all"><br>-- <br>David J. Lynch<br><a href="mailto:djlynch@gmail.com">djlynch@gmail.com</a><br>