[mkgmap-dev] no_u_turn

Sun Oct 4 20:05:58 BST 2009

2009/10/4 Carlos Dávila <cdavilam at jemila.jazztel.es>

> Mark Burton escribió:
> > Hi Paul,
> >
> >
> >> Can I make this a feature request then? :) Consider the following
> >>
>                       X
> >>         |
> >> A      B|       C
> >> --------+------->
> >>         |
> >> <-------+--------
> >> D      E|       F
> >>         |
> >>         \/
> >>         G
> >> ABC is oneway in direction ABC
> >> FED is oneway in direction FED
> >> BE is twoway but is marked with direction BE
> >>
> >> U turns are not allowed for FEBC nor are they allowed for ABED
> >>
> >> I have several of these near me and I'm sure they're fairly common (if
> >> not yet in the OSM database). Current mkgmap maps will tell me to make a
> >> U turn (FEBC or ABED)
> >>
> >
> > Well, that's a lovely bit of ascii-art. I understand completely what
> > you want to achieve. Isn't it the same as having a no_right_turn for
> > BED and a no_right_turn for FEB?
> >
> Not, because if you come from X, BED is allowed, and if you come from G,
> EBC is also allowed. I don't know if XBEG exists in Pauls cases, but I
> have one like this in my city.
> Cheers
> Carlos
>

not sure if mkgmap or other routing tools can resolve it if the from/to ways
are not both connected to the via node. then the relation should be like
this. restriction relations are documented on the wiki that the via must be
a node not a way.
no_right_turn
from AB
via B -> instead way BE
to ED

crazy but this is the current definition of turn relations

> > Cheers,
> >
> > Mark
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> >
> >
>
>
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