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Re: [sumo-user] Missing lane observations in queue-output
The current implementation only writes queues if at least one of the two attributes 'queuing_length' or 'queueing_length_experimental' exceed the value of 1.
An absence of queue output can thus be interpreted as the absence of any kind of queue (whether by waiting vehicles or slow vehicles). 

regards,
Jakob


Am Mo., 16. März 2026 um 12:43 Uhr schrieb Nikiforos Mpotzoris via sumo-user <sumo-user@xxxxxxxxxxx>:
The issue encountered is that, although the examined road cross-section appears to have three lanes, after adding the following command to the.sumocfg file, observations are not produced for all lanes.

<queue-output value="queue_output.xml"/>

More specifically, as shown below from the output file, observations are not recorded for every lane at every time step, regardless of whether the corresponding value is zero or not. In some cases, a lane is explicitly included with a value of 0, while in other cases no entry or value is provided at all for certain lanes. As a result, it is unclear whether the absence of an entry should be interpreted as zero value or as the lack of recording for that particular lane in the output. Below are some indicative excerpts from the queue output at successive time steps, in order to illustrate the issue more clearly:

<lane id="Egnatia_0_1_se_1" queueing_time="4.60" queueing_length="10.01" queueing_length_experimental="10.01"/>

 <lane id="Egnatia_0_1_se_3" queueing_time="6.70" queueing_length="20.33" queueing_length_experimental="20.33"/>

In the above case, no entry is provided for lane Egnatia_0_1_se_2

<lane id="Egnatia_0_1_se_3" queueing_time="0.00" queueing_length="0.00" queueing_length_experimental="29.27"/>

In this case, entries for lanes Egnatia_0_1_se_1 and Egnatia_0_1_se_2 are also missing, even though the output does include the lane with a value of 0.00.

The question is whether the above behavior is the expected mode of operation of queue-output or whether it indicates an error or inconsistency in the generation of the output file. More specifically, in cases where no entry is shown for a given lane, should this be interpreted as a zero value, or is there a possibility that an entry corresponding to a real, non-zero value is being omitted?

The queue-output.xml file was generated using both SUMO version 1.25 and version 1.23.1.


Thank you in advance for your time and assistance.

 

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