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Re: [sumo-user] Regarding average speed in Edge based traffic measures
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This sounds like a km/h vs m/s mismatch. If you define your edges with 16km/h than the average speed would typically be a bit lower i.e. ~14 km/h (due to random slow-downs and interactions of vehicles with different desired speeds). This would then be presented to you by sumo as ~3.8 m/s .
Dear community,
Regarding the previous discussion on average speeds in SUMO, I have encountered another setback. Earlier I was using SUMO-GUI to generate a graph of the average speed of the whole network (at 5-minute intervals) and save it as a CSV file. Then I thought that if I got aggregated average speed of all the edges in the network, it should be equal to the values obtained from SUMO-GUI, but this is not the case. Could you explain how the average speed for the whole network is calculated and how I can get the same values through the edgeData file?
I wanted to compare these values as even though I had a max allowable speed of 16 and the vehicles were free-flowing, the average speed in SUMO-GUI would be around 3-4.
Thanks and regards,
Rohan
The speed value is computed as travelledDistance / sampledSeconds.
You should be able to replicate the aggregated speed value by the following procedure:
- for each edge compute travelled distances as speed * sampledSeconds
- sum up the distances and sampledSeconds
- take the quotient of the sums
Dear community,
I have been trying to understand how the average speed is calculated in edge-based traffic measures. I know it is space-mean speed but I am trying to aggregate data for multiple edges.
I first generated average speed of two edges using edges="" and aggregate="True" method, then I generated average speed of the two edges separately. Now, I have tried arithmetic mean, harmonic mean, weighted average by numbers but cannot get the value equal to the aggregated value given by SUMO.
Kindly suggest in what way can I manually aggregate the average speed data so as to get same value as when being done by aggregating directly through SUMO.
Thanks and regards,
Rohan
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