[sumo-user] mean speed - traffic measures output

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[sumo-user] mean speed - traffic measures output

Natalia Liora
Hi,

In the generated output file for the traffic measures for each edge/lane (https://sumo.dlr.de/docs/Simulation/Output/Lane-_or_Edge-based_Traffic_Measures.html
the definition of estimated mean speed is given as "This is an average over time and space (space-mean-speed), rather than a local average over the vehicles (time-mean-speed). Since slow vehicles spend more time on the edge they will have a proportionally bigger influence on average speed. “

How the term “space” is defined ? Could you please specify how exactly the mean speed has been estimated?

I understand that the generated speed does not take into account the mean speed value over all the vehicles per second counted on the edge  and finally averaged over the whole simulation period, right ? 

Thank you.
Regards,
Natalia



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Re: [sumo-user] mean speed - traffic measures output

Jakob Erdmann
Speed is just the average of all speeds on the edge over the given time. Each time step the speeds on the edge are sampled and the average of all samples (over the specified time interval) is used. Slower vehicles spend more time on an edge and thus contribute more samples and this explains the difference to a point-average of speeds.



Am Mo., 29. Juni 2020 um 09:32 Uhr schrieb Natalia Liora <[hidden email]>:
Hi,

In the generated output file for the traffic measures for each edge/lane (https://sumo.dlr.de/docs/Simulation/Output/Lane-_or_Edge-based_Traffic_Measures.html
the definition of estimated mean speed is given as "This is an average over time and space (space-mean-speed), rather than a local average over the vehicles (time-mean-speed). Since slow vehicles spend more time on the edge they will have a proportionally bigger influence on average speed. “

How the term “space” is defined ? Could you please specify how exactly the mean speed has been estimated?

I understand that the generated speed does not take into account the mean speed value over all the vehicles per second counted on the edge  and finally averaged over the whole simulation period, right ? 

Thank you.
Regards,
Natalia


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