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Strange routing around gates #3128

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openstreetmap-trac opened this issue Jul 23, 2021 · 5 comments
Closed

Strange routing around gates #3128

openstreetmap-trac opened this issue Jul 23, 2021 · 5 comments

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@openstreetmap-trac
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Reporter: tko
[Submitted to the original trac issue database at 6.23pm, Saturday, 17th July 2010]

Richmond Park has gates on some entrances (presumably should be on all) that seem to be causing some very weird routing decisions resulting in several kilometers trip to get to the other side. Oddly enough this seems to only happen for bicycle and pedestrian routes, everyone else is expected to just ram through the gates I guess.

For example: http://nroets.dev.openstreetmap.org/demo/index.html?lat=51.42944&lon=-0.27535&zoom=14&markers=!51.43627,-0.25609!51.43644,-0.2566&v=bicycle&fast=0

@openstreetmap-trac
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Author: openstreetmap[at]rational.co.za
[Added to the original trac issue at 5.16pm, Sunday, 18th July 2010]

The destination is on a way marked as "access=no, foot=yes". So for non-pedestrians it concludes that you misplaced the marker (possibly because of bad GPS reception) and looks for the nearest way that accommodates that vehicle.

For cyclists, its the footway a few meters to the North.

For motorvehicles, it's the unclassified East of the gate.

Hence the routes differs so dramatically.

Perhaps the best solution would be for YOURS to warn the user that the placement of the marker is suspect.

@openstreetmap-trac
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Author: openstreetmap[at]rational.co.za
[Added to the original trac issue at 6.10pm, Sunday, 18th July 2010]

Perhaps the best solution would be for YOURS to warn the user that the placement of the marker is inconsistent with the data.

@openstreetmap-trac
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Author: tko
[Added to the original trac issue at 6.30pm, Sunday, 18th July 2010]

In http://nroets.dev.openstreetmap.org/demo/index.html?lat=51.45343&lon=-0.25758&zoom=17&markers=!51.45507,-0.25673!51.45344,-0.25848&v=bicycle&fast=0 similar strange routing happens, now for everyone. Changing destination between cycleway and the unclassified road makes no difference. Considering both end points are on signed cycle route this detour is fairly major for cycle routing.

Maybe I'm missing something about the ways, but to me the cause seems to be the gates as the route always goes through a way that doesn't contain a gate.

@openstreetmap-trac
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Author: openstreetmap[at]rational.co.za
[Added to the original trac issue at 6.45pm, Sunday, 18th July 2010]

My interpretation of barriers are that they default to access=no. Either specify all the access tags, or file a new ticket citing the relevant wiki page.

@openstreetmap-trac
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Author: mmd
[Added to the original trac issue at 6.56pm, Tuesday, 19th May 2020]

Gosmore project is no longer active, closing.

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