[Routing] Leave motorway, turn onto track

[Nic Roets]

If it's legal to enter the motorway from the track, you can model the track
(or part thereof) as oneway.

If entering and leaving are both disallowed you can tag it as access=no, or
"unmerge" the shared node.

If we allow too many special routing rules it become difficult to implement
them in all the different formats (Large database like PG, embedded like
gosmore, Garmin etc).

On Fri, Oct 10, 2008 at 3:52 PM, Frederik Ramm <frederik at remote.org> wrote:

> Hi,
>
>    it is not uncommon in Germany for a track (highway=track) to be
> connected to a motorway in such a fashon that you could theoretically
> turn onto the track from the motorway if you were travelling at 10
> mph or so.
>
> It isn't allowed of course, and that should perhaps be modelled
> through appropriate turn restrictions.
>
> I wonder if it would nevertheless make sense for routing engines to
> implicitly disallow leaving a motorway on anything else than a
> motorway_link (or at least not on something as small as a track).
>
> Here's an example (where the route leaves the motorway in the north):
>
> http://yournavigation.org/?
> flat=49.016459&flon=8.456449&tlat=49.089696&tlon=8.546314&v=motorcar&fas
> t=1&layer=mapnik
>
> Bye
> Frederik
>
> --
> Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"
>
>
>
>
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