Re: [sumo-user] Fundamental diagram

[Amirhosein Karbasi <amirhosein.karbasi98@xxxxxxxxx>]

Thank you, dear Jakob.

1.now if I use freq equal to traffic light cycle the problem will be solved?

2.you said "the flow data points you are using are for individual edges. If you need a whole-network diagram you need to sum up the edges flows and compute an average density." for flow I should only aggregate flows in the intervals and should I compute average ?

3. you said " in your scenario, the flow is mostly affected by the traffic lights rather than the vehicle density. Thus it will look different from a motorway diagram". is this normal in intersections?

On Thu, Jun 11, 2020 at 4:55 PM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:

1) in your scenario, the flow is mostly affected by the traffic lights rather than the vehicle density. Thus it will look different from a motorway diagram

2) the flow data points you are using are for individual edges. If you need a whole-network diagram you need to sum up the edges flows and compute an average density. Also, the flow is averaged over 300s (more than one traffic light cycle). This means you are not seeing peak flow on green but the average flow including stopped-on-red

3) I recommend that you use 'entered + departed' for you flow computation. Also, there are probably edges that have low vehicle counts but downstream congestion prevents vehicles from advancing and thus gives zero flow.

regards,

Jakob

Am Do., 11. Juni 2020 um 12:20 Uhr schrieb Amirhosein Karbasi <amirhosein.karbasi98@xxxxxxxxx>:

Hello,

I want to draw a flow density diagram. My network includes 64 intersections. I ran a simulation (1800s) and use an additional file for Edge-based output (freq is 300). I drew a flow density diagram in excel based on the Edge-based output file and I calculated flow according to “entered * 3600 / freq”. Now I have 3 problems:

1. I think my flow density diagram is not similar to regular flow density diagrams. (there are a png in attach file)(Simulation time = 1800s).

2. When I drew a plot my max flow is about 852 (for 1800s, 2400s, and full-time simulation max flow is approximately 1000) and I think max flow should be bigger than 20000 for a network like this.

3. I have too many zero flows.

I saw various topics about this on the Sumo website but my problems are not solved yet.

I sent my whole files too. please say me what I am doing wrong?

Thank you so much.

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