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[sumo-user] Using vTypeDistribution
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- From: "Bae, Jong In" <jbae42@xxxxxxxxxx>
- Date: Thu, 20 May 2021 12:08:12 +0000
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- Thread-topic: Using vTypeDistribution
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Hello,
I have some questions about how using vTypeDistribution may introduce randomness in simulation even if the seed value and the random-depart-offset value were kept the same.
My experiment is a 2-lane highway. "HVexit" vehicles merge into lane 0 to exit the highway.
The attached screenshot shows the vTypeDistributions in my experiment. The two vehicle types (AV and HV) have the identical properties. Thus, they should behave identically.
In my next experiment, my "HVexit" volume was kept the same and all the other volumes changed. However, the volume changes were made in a way that the total volume of each approach (thru and exit) as well as the total lane volume were kept the same.
In other words, the road conditions (lane volumes) were kept the same - it's just the vehicle compositions changed but the two vehicle types behave identically.
I would expect that these two experiments would have the exact same results. The seed value and the random-depart-offset value were kept the same.
However, the number of vehicles processed (completed their routes) and the average travel time of "HVexit" were slightly different.
I was wondering if using multiple vTypeDistirbution introduced randomness in the simulation.
I know my question was lengthy. Please let me know if I can clarify my question in any way.
Thank you so much in advance for your help!
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Attachment:
Screen Shot 2021-05-20 at 8.20.17 PM.png
Description: Screen Shot 2021-05-20 at 8.20.17 PM.png
