Re: [sumo-user] Swerving / fishtailing of vehicles when using sublane mo

[Jakob Erdmann via sumo-user <sumo-user@xxxxxxxxxxxxxxxxxxxxx>]

Thank you for providing the example scenario. The issue (
http://sumo.dlr.de/trac.wsgi/ticket/3333) is fixed in revision [25500].
The relevant aspect of your scenario for exposing this problem was a
mismatch between lane width, vehicle width and the minGapLat attribute
(default 1.0m). In your scenario, the vehicles were unable to maintain
their minimum preferred lateral gaps even when driving in the center of
their lane. Setting vType attribute minGapLat="0.8" would also mitigate the
issue.

regards,
Jakob

2017-07-25 10:48 GMT+02:00 Kaths, Jakob <jakob.kaths@xxxxxx>:

> Hi,
>
>
>
> I hope I prepared a meaningful and minimal enough example. It can be
> downloaded here: https://syncandshare.lrz.de/dl/fiMpaoK6ajFTxaMLLcs5czyX/
> minimal_test_fishtail.zip
>
>
>
> For example AB_counter_car.3 leaves the network straight on the second
> lane, whereas AB_counter_car.27 alternates between 203.88 degrees and
> 205.86 degrees from step 69.1 on.
>
> The alternating indicators can be seen on some of the trucks. With curved
> networks and more variable traffic, the effects become more obvious though.
>
>
>
> I hope that helps, let me know, if I can provide anything else.
>
>
>
> Thanks again
>
>
>
> Jakob
>
>
>
> *Von:* Jakob Erdmann [mailto:namdre.sumo@xxxxxxxxxxxxxx]
> *Gesendet:* Dienstag, 25. Juli 2017 14:36
>
> *An:* Kaths, Jakob <jakob.kaths@xxxxxx>
> *Cc:* sumo-user@xxxxxxxxxxxxxxxxxxxxx
> *Betreff:* Re: [sumo-user] Swerving / fishtailing of vehicles when using
> sublane model
>
>
>
> Hello,
>
> fluctuation decisions indicate a bug in the sublane lane-change model. You
> can help to get this fixed by providing a minimal example scenario (the
> fewer vehicles and edges the better).
>
> regards,
>
> Jakob
>
>
>
> 2017-07-25 6:10 GMT+02:00 Kaths, Jakob <jakob.kaths@xxxxxx>:
>
> Hi,
>
>
>
> sorry to warm this topic up again. I’ve been looking a bit more into it
> again and I definitely see some improvement, but the behavior of the
> sublane model with 0.1 s step still leads to a frequent change in the sign
> of the yaw rate of vehicles. Furthermore, for some vehicles, there seem to
> be fluctuating decisions about lane changes, so each step they redecide and
> the indicators blink right and left alternating each step.
>
> Is this still considered a bug or just the nature of the sublane
> lane-change model? If the latter is the case, are there suggested parameter
> sets to damp this behavior?
>
>
>
> Thanks a lot for your suggestions
>
>
>
> Jakob
>
>
>
> *Von:* Kaths, Jakob
> *Gesendet:* Freitag, 14. Juli 2017 13:18
> *An:* sumo-user@xxxxxxxxxxxxxxxxxxxxx
> *Cc:* 'Jakob Erdmann' <namdre.sumo@xxxxxxxxxxxxxx>
> *Betreff:* AW: [sumo-user] Swerving / fishtailing of vehicles when using
> sublane model
>
>
>
> Sorry, I should have tried the latest developer version first. Looks a lot
> better on first glance! Thanks!
>
>
>
> *Von:* Jakob Erdmann [mailto:namdre.sumo@xxxxxxxxxxxxxx
> <namdre.sumo@xxxxxxxxxxxxxx>]
> *Gesendet:* Donnerstag, 13. Juli 2017 14:10
> *An:* Kaths, Jakob <jakob.kaths@xxxxxx>
> *Cc:* sumo-user@xxxxxxxxxxxxxxxxxxxxx
> *Betreff:* Re: [sumo-user] Swerving / fishtailing of vehicles when using
> sublane model
>
>
>
> Hello,
>
> this is due to a bug which has been fixed in the latest development
> version.
>
> regards,
>
> Jakob
>
>
>
> 2017-07-13 8:05 GMT+02:00 Kaths, Jakob via sumo-user <
> sumo-user@xxxxxxxxxxxxxxxxxxxxx>:
>
> Hi everybody,
>
> I know there have been some bugfixes in this area lately, but still I
> observe somewhat odd behavior when using the sublane model. Especially
> longer vehicles (trucks, busses) in some parts of my network seem to
> fishtail/swerve for no apparent reason. They perform oscillating angle
> changes, which makes them "wiggle" without actually changing lanes. I set
> the lateral resolution to 0.5, the step size to 0.1 and I'm using the SUMO
> 0.30.0 release.
> Are there any hints on how to avoid this behavior? I tried adjusting the
> lateral speed (to 0.1), but it doesn't help.
>
> Thanks!
>
> Jakob
>
> --
> Dipl.-Ing. Jakob Kaths
>
> Technische Universität München
> Ingenieurfakultät Bau Geo Umwelt
> Lehrstuhl für Verkehrstechnik
> Univ.-Prof. Dr.-Ing. Fritz Busch
>
> jakob.kaths@xxxxxx<mailto:jakob.kaths@xxxxxx>
> www.vt.bgu.tum.de<http://www.vt.bgu.tum.de/>
>
>
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