Re: [sumo-user] Import of large cities into sumo - congestions at junctions

[Daniel K. <d.k...@we...>]

Dear Christian,

> -----Ursprüngliche Nachricht-----
> Von: "Klotz, Christian (I/AEV-3)" <AEV...@AU...>
> Gesendet: 24.06.09 10:27:36
> An: <sum...@li...>
> Betreff: [sumo-user] Import of large cities into sumo - congestions at junctions


> Hello!
> 
> I try to simulate a traffic scenario in the city of Ingolstadt for my bachelor thesis.
> I want to do some research about car-2-car communication and so I use Trans to connect Sumo and ns2.
> 

thanks for the information; a short note: TraNS is AFAIK not working with recent SUMO versions. I do not think that major changes are needed, but, though, they request a certain SVN-version of SUMO (almost 2000 commits ago)...


> But now, I have a quite frustrating problem. 
> There are congestions at nearly any complex junction with traffic lights. Even with only  2000 vehicles on the map!
> I have imported the map from OSM and use the SUMO Version 0.10.3.
> 

Yes, it is a known problem.


> There are two reasons for the congestion:
> - the junctions are not correctly build (see at http://www.bilder-hochladen.net/files/bi0s-1-png.html or http://www.bilder-hochladen.net/files/bi0s-2-png.html  )

Aehh, I would rather negate. I haven't tried to edit a map OSM-people are doing, but for me, this looks "over-detailed". What is you opinion how this should look like? I suppose that have of the edges within the junctions shown in both images are not needed (and maybe even false) from both topological and geometrical point of view.
Though, sure, if someone has a better idea how this should look like, please let me know. Maybe it would already help to have a viewer which shows such nodes in detail.


> - the traffic light programs are not correctly generated, for a junction which is connected to another junction (see http://www.bilder-hochladen.net/files/bi0s-3-png.html ).

Yes, that was a SUMO-issue, but it's solved... In the current SVN-version (I do not think that it already worked with 0.10.3) you can give the option --try-join-tls to netconvert and it will, aeh, try to join near-by tls. Works somehow, though it is still not completely well for some pathological junctions. It would be nice if we could share our observations using the following wiki-page: http://sourceforge.net/apps/mediawiki/sumo/index.php?title=OpenStreetMapNetworkImport

But: this is not the only SVN-change. Also the format of traffic light has changed, so you have to use the same SVN version of SUMO. Sorry.



> In this case, vehicles blocks the other traffic at the junction. 
> 
> How can I improve the quality of the map easily?  Of course, I can change every junction by hand and set TLS-Programs by hand.
> This solution is possible for a small map, but quite difficult for a map of a whole city.
> 

Yep, definitely. We have the same problem trying to prepare the TapasCologne scenario... We'll keep on this topic, though besides joining tls, there are other problems, such as not automatically recognized roundabouts (will be probably implemented soon) and fast right-turns (will probably not).

I am sorry we can not help too much. Maybe another idea: I know you try to model Ingolstadt. Why? I mean - is it necessary? Do you have the demand for it? If so, sure go ahead. If not, I would rather forget it. I would then move to the TAPASCologne scenario.

sincerely,
Daniel


> Thanks a lot for every helpful idea !
> 
> Kind regards
> 
> Christian Klotz
> Funktions- und Vorentwicklung
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