[mkgmap-dev] Inter-tile routing now available in trunk

Sat Feb 28 14:08:38 GMT 2009

2009/2/28 Mark Burton <markb at ordern.com>:

> Yes, I think that is the key to getting good routes. Somehow, you need to
> make the GPS want to use the motorways rather than the trunk roads.

As long as we're on the topic of speed profiles of road types - I've
seen a case where my Nuvi needs to route from one motorway to another.
It's basically the route as shown here:

http://data.giub.uni-bonn.de/openrouteservice/index.php?start=-6.2430356,53.410256&end=-6.2214921,53.4198222&pref=Fastest&lang=de

You can see here that OpenRouteService chooses a sub-optimal route, in
favouring a short spell on the roundabout over a longer stretch
(leading to an overall shorter route) on a motorway_link.

In any case, the Nuvi makes the same mistake. Do roundabouts need to
be de-prioritised somehow?

Dermot

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