<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 10 Oct 2019 at 21:23, Warin <<a href="mailto:61sundowner@gmail.com">61sundowner@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div>On 10/10/19 20:46, Martin Koppenhoefer
wrote:<br>
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<div dir="ltr" class="gmail_attr">Am Do., 10. Okt. 2019 um
08:40 Uhr schrieb Frederik Ramm <<a href="mailto:frederik@remote.org" target="_blank">frederik@remote.org</a>>:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">The original mapper
claims that using two separate oneway=yes ways is<br>
clearer and easier, as it does away with the need for turn
restrictions<br>
at junctions.</blockquote>
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<div>this is an interesting aspect: why do we need turn
restrictions, wouldn't it be sufficient to tell the routing
engine that there is a line that cannot be crossed (and add a
tag for interruptions to this on the junction nodes where you
can cross), and we could save a lot of turn restriction
relations which would be already implied?</div>
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<div>I recall this was suggested many years ago, but for some
reason it did not fly. Maybe it is because it was too
complicated to find out under which circumstances (in which
jurisdictions) white lines had which meaning? Maybe we should
not map the lines physically, but according to their legal
meaning, something like (shorter tags would be chosen):
divider that cannot be crossed (legally), divider that can be
crossed legally, divider that can be crossed but only for
turning left not for u-turns, etc.</div>
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Allowing for different diving on different sides of the road?<br>
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Centre cannot be crossed (all) <br>
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Centre cannot be crossed for U turns (turn offs allowed)<br>
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Centre cannot be crossed for turns (U turns allowed)
<p>Centre cannot be crossed for turn offs (U turns, turn ons
allowed)</p>
<p>Centre cannot be crossed for turn ons (U turns , turn offs
allowed)</p>
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<p>centre =no_crossing/no_u_crossing/no_turn_crossing/no_off_crossing/no_on_crossing/yes_crossing/???<br>
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<p>Will need further though, but the above provides for either side
of the road driving. <br></p></div></blockquote><div>That sounds very similar to <a href="https://wiki.openstreetmap.org/wiki/Key:overtaking">https://wiki.openstreetmap.org/wiki/Key:overtaking</a> which let's you determine when you can cross that dividing line when tagged as a single undivided way.</div></div></div>