faq 110269439

DESPITE cleaned network - getting "No route was found from node A to node B"

by Gerald Richter on 2017-06-27 13:27:42

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I do have a larger network which had some isolated (unroutable) areas,

so I ran the netcleaning procedure on the graph
(</ac:plain-text-link-body></ac:link>)

But trying to run the simulation on the resulting network still causes the mentioned errors.

• Why could that be?
• what to do or check?

I checked the vicinity of the nodes for unidirectional linkage,
but everything seems OK and linked in both directions...

I tried with an old nightly and a more recent one, with same results

Update:

I checked the shortest path between the indicated nodes of the errors externally
with a directed-graph Dijkstra implementation.
And got back a distance for all of them...

Remark:

The error message does not indicate, which person / plan (id) it is, that causes the problem,
so I have no means to start looking for the detail of the problem.

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Comments: 1

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Re: DESPITE cleaned network - getting "No route was found from node A to node B"

by Gerald Richter on 2017-06-29 10:11:18

answering my own question now... hoping
the explanation of the solved problem will save some time for someone else

I had some stray links traversable by "car", which led away from a riverside promenade which was itself only traversable in mode "walk". these stray car-links were not connected to the rest of the network otherwise.

A person taking the car from a location close to the stray link was snapped to one of the nodes, which left it stranded in the mode-routing sense.

I wonder how one could streamline such necessary manual fixes...

Since "car" is mostly the main mode considered,

• the network cleaning process could put out some info on mode-restricted islands
• or run with an additional paramter indicating mode(s) to check the network for