OSRM does not use a segment

[gcarrere]

Hi,
I'm using osrm docker image with a custom lua profile for tram.
tram.zip
To reproduce the problem, you need a pbf with france.

The error can be visible while trying to get a route between these 2 points :
http://0.0.0.0:5000/route/v1/tram/-0.361031,49.152897;-0.360878,49.157948?alternatives=false&geometries=geojson&overview=full&steps=true

This is the first segment of a tramway line.
The results give points of the tramway of Bordeaux, which is far from 500 km. Totaly wrong.
I can't figure why osrm is returning me these points.

What I have discovered :

• the error is only on the first point. If I try with points 2 and 3 (to get the 2nd segment of the journey), it works fine : http://0.0.0.0:5000/route/v1/tram/-0.360878,49.157948;-0.360212,49.161324?alternatives=false&geometries=geojson&overview=full&steps=true
• if I remove the reading of "oneway" key, it works. So, it seems that the problem is linked to the fact that this segment is one way. (But segment 2 is also one way and it works, so, I don't understand). Is the problem only happening when oneway and the start of the journey?

Does any one know how to explore osrm files generated at the start of the container, after processing lua files?
Does any one have tips to debug route generation? I tried to put some debug log to understand what happens but it didn't work...
Does any one know how the route generation works? It will help me understand why it returns points that are 500km far.

Thanks for your help.

[gcarrere]

I discovered something interresting : I launched a local frontend to see what osrm understand about the tramway line.
It seems that there is a gap on this segment. The line does not seem to be a coninuous line :

Does anyone has an idea about what is generating this gap?

[gcarrere]

It seems this is the place of the tram stop :

The stop is places in the middle of the segment.
Why this stop is creating a gap in the result?

[gcarrere]

I'm wondering if the issue is not related to the node at the beginning of the segment.
It was not visible by OSM. I saw it with josm.
I tried to add attributes railway=tram_stop and tram=yes.
It is now visible by OSM but the route still does not work.

It seems that osrm does not understand how to enter this segment.
Does anyone know which attribute should I put to tell OSRM that the entry_point of the segment is here?

[gcarrere]

I saw in this post that isolated regions are outlined with pink.
This is my case because I am using tram lines from different cities, that are not linked between them. It is visible on the debug screen.
I this the issue is that OSRM can't find the starting point of the isolated region.
How can I tell OSRM that the starting point is at the beginning of the segment?