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Re: [sumo-user] How vTypeDistribution works
The vehicles that change their route and change onto the right lane cause additional jamming. Once the jam reaches the start of the insertion lane, the flow rate drops below the requested input flow rate and you are getting insertion backlog (the lane is full). Eager-insert only takes affect if their is enough space on the insertion lane but insertion failed on other lanes of the same edge.

Note, that traffic flow in your simulation is also affected by reduced speed at the "sharp" turn on your off-ramp. See https://sumo.dlr.de/docs/Simulation/Intersections.html#speed_while_passing_the_intersection

regards,
Jakob

Am Mo., 27. Sept. 2021 um 15:48 Uhr schrieb Bae, Jong In <jbae42@xxxxxxxxxx>:
Jakob,

Thank you so much for looking into these files.
A brief explanation:
In each volume case, there is a python file (TraCI codes) that commands 'HVexit' vehicles to change their routes once they get to the deceleration zone.

I'm guessing this affects the occupancy of the lane which then affects the vehicle insertion. However, I'm still curious why eager-insert still has no influence in vehicle insertion.

Thank you!

From: sumo-user <sumo-user-bounces@xxxxxxxxxxx> on behalf of Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Sent: Monday, September 27, 2021 2:08 AM
To: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Subject: Re: [sumo-user] How vTypeDistribution works
 
1. Yes. The number of inserted vehicles should be the same for the same input volume
2. Yes. The option was set correctly (subsections like <input> are ignored anyway).

Please provide the input files for the two test cases 1500/0 and 1500/500 so I can investigate the cause of the flow reduction.

regards,
Jakob

Am So., 26. Sept. 2021 um 18:38 Uhr schrieb Bae, Jong In <jbae42@xxxxxxxxxx>:
Jakob,

Thank you for your reply.

I have two follow-up questions.
  1. If what affects the vehicle insertion is the occupancy of the lane that the vehicle is assigned on, what would be the reason that the vehicle count decreases for the same input volume (ex: 1500 veh/hr)? Shouldn't the number of inserted vehicle be the same for the same input volume?
  2.  I just re-ran one of the cases with the option --eager-insert as true. However, the vehicle count came out to be the same as before. The attached image is my sumocfg file in which I set the --eager-insert true. Is this right place and syntax to set this up?

Thank you! 


From: sumo-user <sumo-user-bounces@xxxxxxxxxxx> on behalf of Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Sent: Sunday, September 26, 2021 12:07 PM
To: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Subject: Re: [sumo-user] How vTypeDistribution works
 
Vehicles driving on one lane should generally not affect insertion on the other lane.
However, every time vehicle insertion on an edge fails because the edge is full in the insertion location (can easily happen in two consecutive seconds) no further insertions on that edge are attempted (even on other lanes).  You can test whether this is responsible for your observation by setting option --eager-insert (which keeps attempting insertion for each pending vehicle).
That page also describes other options for avoiding insertion failure.

regards,
Jakob

Am So., 26. Sept. 2021 um 17:32 Uhr schrieb Bae, Jong In <jbae42@xxxxxxxxxx>:
Hello,

I have a 2-lane freeway to which the traffic is distributed as following:
Lane0: 1300 ~ 1500 veh/hr (increment by 100 veh/hr in each run)
Lane1: 0 ~ 500 veh/hr (increment by 100 veh/hr in each run)

And I counted the vehicles at the start of the lane for 3600 seconds.
The vehicle count is shown in 'vehicle count.png'.

Lane0_input and Lane1_input are the assigned values in the vehicle definition.
Lane0_observed and Lane1_observed are the vehicle counts from each run.

What I'm having issues with is the following:
  1. It seems like Lane0_observed is decreasing as Lane1_input increases. Does this mean that when vehicles are released, the distance to the vehicles in the adjacent lane matters?
  2. In Lane0_input: 1500 and Lane1_input: 0 case, Lane0_observed is only 1,427 vehicles. Is this because of the headways from the leading vehicle in lane 0?

Thank you and please let me know if any further clarification is needed!


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