Hi, just to let you know: I am able to reproduce the results with your data. Not sure what happens with the mergeroad map. MapSource finds the shorter route when you select to minimize the distance, and (depending on the speed settings), it even may calculated the shorter time for the shorter route. For both routes I see a list with 7 hints, so the only explanation that I have is that MS prefers routes where don't have to change roads often within a few meters. Gerd
Date: Sun, 29 Dec 2013 10:44:24 -0800 From: franco.bez@web.de To: mkgmap-dev@lists.mkgmap.org.uk Subject: [mkgmap-dev] mergeroads sometimes breaks routing
I found a very strange routing behaviour connected to the mergeroads-patch. The Problem area is here: http://www.openstreetmap.org/#map=17/47.89307/10.63390
When I try to route ( Automobile-mode, minimize-time ) from corner Liegnitzer-Straße/Glogauer-Straße to Beuthener-Straße Nr. 11, I get routed all the way round the block.
Using --x-no-mergeroads the routing is fine.
Even stranger, when I tried to assemble a small testcase with an data-extract from JOSM, the routing is fine, even when using mergeroads.
So the error seems to be triggered by something specific to the tile that was generated when building a map of Bayern.
See screenshots:
Bad Routing with mergeroads:
<http://gis.19327.n5.nabble.com/file/n5791132/mergeroads-9452.bmp>
Routing OK with --x-no-mergeroads:
<http://gis.19327.n5.nabble.com/file/n5791132/no-mergeroads-19995.bmp>
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