If I remember correctly the idea of a through_route was first raised by
Mark Burton a few years ago. It was intended to solve the problem of
TOTSO's
(https://en.wikipedia.org/wiki/Glossary_of_road_transport_terms#TOTSO)
which is a situation where you have to turn off the carriageway you are
currently travelling on in order to stay on the same named road. In
these circumstances it is (almost) impossible for any routing engine to
deduce that it needs to give you a routing hint in order for you to stay
on the road that you are currently on. At the time I had a couple of
these near me where I knew that my Garmin was effectively missing a turn
and hence you would end up travelling in the wrong direction. Adding a
through_route at these places fixes this problem.
There is also a secondary use where a road e.g. Smith Road, bends 90
degrees and you are sometimes told to turn left/right to stay on Smith
Road even though there is no turning
A few years ago I tried to get this accepted into the list of official
tags however the vote resulted in a draw and I didn't have chance to
pursue it further.
I have now moved and there are none currently near me that I could use
to check if this is still working
See also......
http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2013q2/017429.html
http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2010q1/007028.html
Thanks
Paul
On 01/10/2017 08:31 AM, Gerd Petermann wrote:
I found one that might be interesting:
https://www.openstreetmap.org/relation/406379
If I got that right the intention was to tell mkgmap that
it should change the bearing (heading) values in the map so that the Garmin
algo doesn't produce a
hint like "Turn left onto Calle Botánico Rivas Mateos" when travelling from
way 24647941 (Calle José Luis Cotallo) to way 24311294 (Calle Botánico Rivas
Mateos).
(this is what happens now)
What would you want instead?
@Carlos: You have created that relation in 2010, maybe you remember?
Gerd
Gerd Petermann wrote
Hi all,
I've noticed that mkgmap still checks these relations for correctness but
they have no influence on the created map.
Part of the code that handled them was removed with r3649:
http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3649
If your map was created with r3743 or later, please check if you find a
crossing with such a relation which where routing
hints are wrong. In that case I would try to add code for the support,
else some unused code can be removed.
Gerd
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