On Fri, May 14, 2010 at 04:51:21PM +0100, Paul wrote:
What are via ways in restrictions? Could you give some practical example of what they do and what they are needed for?
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?
This is something I brought up a while ago. Consider the following
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 but all other turn are allowed
In this situation the "via way" is BE and you create a no_u_turn trstriction from FE, to BC, via BE. Up until now mkgmap would ignore this restriction as it couldn't handle it.
There are loads of these near me and I suspect in many other places as well
Sure, every place where there is a major road that is mapped as two antiparallel oneways. Usually U turns and across-the-ongoing-traffic turns would be prohibited, and the 'via' would be a two-node way, not a node. Marko