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Re: [sumo-user] Turning movement on a sublane

Dear SUMO team,

Thanks for the suggestions.

I did change the values of lcSublane and lcSpeedGain. It turned out that we could indeed prevent the blocking situation by doing so, but the outcome was that basically all bicycles queue on the right side of the lane, which is unrealistic. Is it possible to split the flow into two types (turning and non-turning) and only change the values for those bicycles in the turning flow? (Namely, applying different junction turning probabilities to different flows) I found it difficult to achieve when using jtrrouter.

Attached please find the files.

The second suggestion you gave is also nice and practical, but it may make the network more complicated. I will consider that if simply changing the values fails to achieve what we want.

Thank you very much.

Best regards,

From: sumo-user <sumo-user-bounces@xxxxxxxxxxx> on behalf of Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Sent: Tuesday, 10 January 2023 8:55:55 AM
To: Sumo project User discussions
Subject: Re: [sumo-user] Turning movement on a sublane
Hi, it should work by increasing the value of lcSublane and possibly lowering the value of lcSpeedGain. If not, please attach the scenario files.
Also, you might actually split the single bicycle lane into several narrow lanes at the junction to define dedicated queues for each turning movement (see image)

Am Di., 10. Jan. 2023 um 03:03 Uhr schrieb Ni Ying-Chuan <>:


I am using the sublane model to simulate bicycle traffic on a bike lane network with signals. The lane width is 2 m, which is divided by four 0.5 m-width sublanes. The latAlignment is set to "right".

When I included turning movements at intersections, I observed that some bicycles would queue on the left side of the lane and could not find the proper gap to switch back to the right side and make a right-turning movement during green light because of other straight bicycles on the right side of the lane. It hence blocked the bicycles behind it a little bit and reduced the flow rate.

I tried to tune several parameters in the SL2015 model to avoid this. For instance, I set lcTurnAlignmentDistance to 100, but this would not make any difference since the latAlignment is on the right already. I also tuned lcSublane, lcPushy, and lcAssertive to encourage or enable bicycles to stay on the right, but some turning bicycles still go to the left when there is space for queueing. Is there any way to ensure these turning bicycles always keep themselves on the right side of the lane instead of queueing on the left in the sublane model setup?

Thank you very much for answering me!

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