[OSRM-talk] Need more instructions

Daniel Patterson daniel at mapbox.com
Fri Oct 16 22:15:47 UTC 2015

Hi Martin,

  You're looking at the right code, but it's not used during `viaroute`.  The turn instruction flags are baked into the graph structure that is generated during `osrm-extract`.

> On Oct 16, 2015, at 1:08 PM, Martin Bang Andersen <datscharf at gmail.com> wrote:
> Hi all,
> I have previous written about my troubles with missing instructions when a secondary road has the same name as the primary road, then this turn/instruction is somehow optimized out of the instruction set. 
> See for example: 
> http://map.project-osrm.org/?z=16&center=56.176718%2C10.168061&loc=56.176712%2C10.168061&loc=56.177751%2C10.156174&hl=en&ly=&alt=&df=&srv= <http://map.project-osrm.org/?z=16&center=56.176718%2C10.168061&loc=56.176712%2C10.168061&loc=56.177751%2C10.156174&hl=en&ly=&alt=&df=&srv=>
> Here the final instruction tells me: "Left onto Haslegårdsvej" and then after 150m it says destination reached. It does not tell me to turn right onto the secondary part of Haslegårdsvej after about 100m.
> Can anybody point me to the place in the source code where this turn is removed from the list of instructions? I have looked a lot of places and my best bet until now is the AnalyzeTurn function in extractor/edge_based_graph_factory.cpp:
> // If street names stay the same and if we are certain that it is not a
>     // a segment of a roundabout, we skip it.
>     if (data1.name_id == data2.name_id && data1.travel_mode == data2.travel_mode)
>     {
>         // TODO: Here we should also do a small graph exploration to check for
>         //      more complex situations
>         if (0 != data1.name_id || m_node_based_graph->GetOutDegree(node_v) <= 2)
>         {
>             return TurnInstruction::NoTurn;
>         }
>     }
> but it does not seem to be called during a viaroute request.
> Best regards
> Martin Bang Andersen
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