[OSM-talk] Which type of highways are used by routing software?

Lester Caine lester at lsces.co.uk
Wed Nov 2 09:55:16 UTC 2016


On 02/11/16 08:41, Paul Johnson wrote:
> On Wed, Nov 2, 2016 at 3:00 AM, Lester Caine <lester at lsces.co.uk
> <mailto:lester at lsces.co.uk>> wrote:
> 
>     On 02/11/16 00:57, john whelan wrote:
>     > If OSMand etc treat them differently then we may not be showing the
>     > shortest route.
> 
>     OSMAnd currently does not use the best routes in any rural area! While
>     the roads even in the UK may be 'unclassified', in many rural areas they
>     are the main routes and I have asked before how this 'bug' can be fixed.
>     Reclassifying the road is obviously wrong, but similarly changing the
>     routing rules is wrong for other parts of the world, so it's not just a
>     case of which routes are used, it's how the bias is applied to those
>     routes ... and currently OSMAnd is simply wrong for the UK!
> 
> 
> Try playing with the routing settings in Osmand.  My part of the world
> can get similarly obscure at the low end, but usually setting shortest
> route helps.

Unfortunately it needs a little more than just that. The end points need
'shortest route', but once one has avoided the - in my case 10 mile
detour going north - one wants the motorway rather than the slightly
shorter 'old road'. I have tried playing with the biases in the past but
invariably they get reset by some update and I'm back to square one. So
now I just take the 'b' roads and let the routing catch up later :)

There is room for a more general discussion on standardising some of the
tagging data along with the routing biases so that one can select a set
of rules that best fit personal experience rather than having to try and
live with less optimal generic rules?

-- 
Lester Caine - G8HFL
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