Hello,
the relationshipt between densitiy and flow comes from the interaction
between vehicles. There are basically two components to that:
1) interactions in car following due to differing desired speeds (which
includes slow-downs and lane-changing). Unfortunately for your case, sumo
vehicles have the same desired speed by default so you will net see any
effect unless you change vType parameters. I recommend setting
speedDev="0.1"

2) Intersections. (i.e. slowdowns when flows merge on a motorway, lane
changing to take the exit, waiting at a traffic light or some other
intersections where right-of-way must be considered.

If you just insert default vehicles on a 3-lane street you will see neither
of these effects.
On a side node, SUMO alone is probably not the right tool to figure out the
maximum capacity of your roads. The value you will see depends on the
calibration parameters of the models and the default parameters may not fit
to the driver behavior in your city. I suggest you complement your research
with some real-world data.

regards,
Jakob



2018-03-05 22:47 GMT+01:00 mohsen hs <mohsenh...@yahoo.com>:

> Hello there,
>
>
> I am doing some analysis on the road networks of my city and would like to
> find the max capacity of our roads. To accomplish this,  the relation
> between occ and flow needs to be visualized.  When I do this even by
> entering 2000 vehicle in a 3 lane street (uniformly timestamped) in an hour
> (which practically takes two hours to insert this amount and deliver them
> to the destination (end of street/segment)), i can't see such a '^'
> relation between occ and flow as expected.  I tried different scenarios and
> streets and it is usually a messy line with positive slope like this '/' .
> So, I wonder if anybody has tried this before or have any advice.
>
> Many thanks
> Mohsen
>
> Sent from Yahoo Mail on Android
>
>
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