Re: [sumo-user] Inefficient merging

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

There is no logic that would intentionally do this kind of downgrade. My best guess is that there are two junctions very close to each other you set "zipper" on the wrong one. Moving things around could these junctions to be merged and thus resolve the issue (or a it's simply a bug). If you provide the original network file where zipper doesn't seem to work I'll take a look at it.

Am Fr., 20. Jan. 2023 um 20:05 Uhr schrieb lcc <lccycc123@xxxxxxxxx>:

Thanks Jakob! The network file sets the intersection type to "zipper".

I tried to use netedit to move the intersection further, now the color changes to light brown color and vehicles can be merged correctly.

It seems like the problem is that if the angle between the freeway and the ramp is too large, then setting type="zipper" will not work and sumo will treat it as "priority".

Now this problem has been resolved.. Just curious which logic triggers this downgrade of "zipper" -> "priority"?

On Thu, Jan 19, 2023 at 5:59 PM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:

If you want to model zipper merging, set the junction type to "zipper". The color of your connection arrows indicates that the junction is of type "priority".

You'll know that you have it set up correctly if the color of the connections changes to a light brown color.

Am Fr., 20. Jan. 2023 um 00:04 Uhr schrieb lcc <lccycc123@xxxxxxxxx>:

There is a connection. Its color is grey and hard to see

On Thu, Jan 19, 2023 at 2:57 PM joerg <schweizer.joerg@xxxxxxxxx> wrote:

cannot see a connection from the ramp to any lane of the freeway

On 19/01/23 20:18, lcc wrote:

Hi barthauer,

Thanks a lot for the suggestion! I have updated to 1.15.0 and the problem still exists.

see below screenshot: the ramp (the arrows) vehicles cannot move, even if 4 out of 5 freeway lanes are closed.

Did I do something stupid to the connection?

On Wed, Jan 18, 2023 at 11:36 PM m.barthauer@xxxxxxxxxxx <m.barthauer@xxxxxxxxxxx> wrote:

Hi,

 

if there is no major reason for keeping the old SUMO version, could you please update to SUMO 1.15 to check if your problem persists? It could be a bug which had been solved in the meantime.

 

Best regards

Mirko

 

 

 

-----Original-Nachricht-----

Betreff: [sumo-user] Inefficient merging

Datum: 2023-01-19T01:22:42+0100

Von: "lcc" <lccycc123@xxxxxxxxx>

An: "sumo-user@xxxxxxxxxxx" <sumo-user@xxxxxxxxxxx>

 

 

 

Hi sumo developers:

 

I'm using sumo 1.6.0 and have a common problem with merging.

 

Say I have a freeway (5 lanes) and a on-ramp (1 lane) that merge to the freeway's right most lane

 

the merging type (junction type) is zipper

 

The vehicles on the ramp, however, cannot drive through the junction and wait infinitely, because there are vehicles on the other freeway lanes. Those freeway vehicles don't need to be on the right most lane.. Any vehicle on any of the 5 lanes will block the ramp vehicles.

 

An experiment I did is I closed the right-most lane of the freeway, using sumo-gui. The issue persists.

 

Any ideas to solve this behavior?

 

Thanks a lot!



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