[mkgmap-dev] [PATCH v2] Advanced restrictions

Fri May 14 12:38:38 BST 2010

On Fri, May 14, 2010 at 01:27:59PM +0200, Felix Hartmann wrote:
>What are via ways in restrictions? Could you give some practical 
>example of what they do and what they are needed for?

When there is a junction of two highways that are both mapped as two 
parallel oneways, the "via" of turn restrictions will not be a node but 
one of the four two-node lines (an edge of the "square") at the 
crossing.

>Would they increase the maximal routing distance? Or maybe it the fact
>that they are missing the reason for our intertilerouting in Mapsource
>which is not working correctly?

As far as I understand, mkgmap currently ignores turn restrictions where 
the via member is not a node. My guess is that obeying turn restrictions 
could decrease the maximal routing distance, not increase it.

	Marko
(who uses a "car" (default) map for pedestrian and bicycle routing)