It would help if you posted the error message (using option --log may make
it easier to find the error). The message should at least tell you which
vehicle / origin-destination is causing the problem.
There are only a few types of errors that cannot be ignored with
--ignore-route-errors (i.e. the starting edge is unknown or  has no
permissible lane for the vehicle).
For investigating connectivity, see
https://sumo.dlr.de/docs/sumo-gui.html#check_connected_components (use this
on the from-edge).

Am Mo., 7. Sept. 2020 um 13:47 Uhr schrieb Richard Tasgal <[email protected]
>:

> I'm trying to simulate identical traffic -- trips with the same start and
> end points, and scheduled to leave at the same time -- across multiple road
> networks. The road networks are supposed to have identical edges, but the
> intersections differ from network to network. Every edge should be
> reachable from every edge, though in some cases the routes may be
> roundabout due to restrictions on allowed turns, and I'm not sure if the
> routing algorithm does a complete enough search to always find a valid
> route.
>
> I'm currently generating the sets of trips using randomTrips.py with one
> of the network files, and I use the same trips file (start and end edges,
> not middle) with all of the different network files. Although if I did
> everything correctly, the trips should be viable for all the different
> networks, and most trips are OK in all the different networks; but contrary
> to my expectation, the simulation often stops because it can't find a path
> between one edge and another edge.
>
> I am using the option --ignore-route-errors which I thought would have let
> the simulation skip trips that it can't find a route for. However, it's
> still happening and the whole simulations are stopping. I'm using TraCI to
> run each step, but I'm not putting in the trips that way, rather I'm using
> a route file.
>
> I thought about trapping the error in python (try except), but I don't see
> how to do this using a route file. All I can think of is something that
> would take considerably more work: obtaining the list of all edges, and
> choosing start and end points and departure times), adding the trips by
> using traci.vehicle.add(), and using try: except: on the
> traci.vehicle.add(). This seems (guessing) like more work than necessary,
> like I'm overlooking a better solution.
>
> Any ideas about where I might be going wrong, so I can make corrections
> more easily?
>
> Rich Tasgal
>
>
>
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