[Routing] [motorway_link] description of direction

Frederik Ramm frederik at remote.org
Sun Jun 15 22:12:01 BST 2008


Hi,

> I'd think a better 
> solution, which would make more countries happy, would be to be able to 
> tag a given node for example as

Nodes cannot point in a direction, so having a signpost tag on a NODE
is utterly useless except in the few situations where the node sits on
exactly one way that is oneway ;-)

The proper way to deal with this is to use relations very much like
turn restrictions, with three members - a "coming from" and a "going to"
way plus, possibly, the node where you change ways.

The relation would then be tagged with the signage and/or driver 
instructions that one would have to follow to get from one way onto
the other.

So the same junction could have any number of such relations ("if
you come from A road and want to catch B road, follow the signs
for Dypswyddle" or so). A router or in-car navigator would search
for such relations for every junction it routes you over.

This would not only cover signage, but also complex instructions
like "use second-from-left lane and make sharp turn" or whatever.

Bye
Frederik

-- 
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"





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