Skip to main content
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [List Home]
Re: [sumo-user] Question about Routing by Effort using SUMO

Hi James,

 

regarding your questions:

 

1. You can leave out the traveltime attribute.

 

2. You are free to define TAZ like described here where all edges have the same weight.

 

3. There is a note in the docs about it. For odtrips the TAZ weight is used exclusively to select the departure edge.

 

4. See answer to 3. Sumo will rely on travel times for routing.

 

Best regards

Mirko

 

 

-----Original-Nachricht-----

Betreff: Re: [sumo-user] Question about Routing by Effort using SUMO

Datum: 2023-08-16T21:37:57+0200

Von: "James Cheng" <jamescheng@xxxxxxxxxxxx>

An: "Mirko Barthauer" <m.barthauer@xxxxxxxxxxx>

 

 

 

Hi Mirko,
 
Thank you so much for the response! Here are some follow up questions we have:
  1. If we use a separate attribute, such as cost, and specify it in the --weight-attribute argument, do we still need to include the travel time in our weight file? Specifically, if we specify a weight attribute, would duarouter only use cost as the weight or would it also consider the travel time? I noticed in the example you sent, the travel times were all set to 1. For example, should we use <edge id="1to3" cost="6"/> or <edge id="1to3" traveltime=”1” cost="6"/> ?
  2. For our project, we don’t see a need for the TAZ weight, as we ultimately only want to route by cost = travel time + toll and don’t want a probability distribution to choose departure/arrival edges in a TAZ. Is there a way to still use od2trips but disregard the TAZ weights (such as setting all weights to be 1)? 
  3. Follow-up to question 2: If we have both TAZ weights and a weight file, which weight will take precedence, or are they both used? For example, say a TAZ has two departure edges A and B. Edge A has probability 0.8 and effort 100, while Edge B has probability 0.2 and effort 50. Would the simulation take into account both the probability and cost or just one of the attributes?
  4. Is the TAZ weight relevant only at the initialization of the simulation or will the weights/probabilities be used iteratively throughout the entire simulation?
Thank you for your clarifications!
 
Best,
James

On Mon, Aug 14, 2023 at 4:32 AM Mirko Barthauer <m.barthauer@xxxxxxxxxxx> wrote:

Hi James,

 

you can use a separate attribute as effort and specify it through the --weight-attribute argument. See the examples from our tests. TAZ weights are a different topic – they are used to select a departure/arrival edge inside a TAZ (calling od2trips only, not duarouter/sumo) but not for the routing between origin and destination. See the docs.

 

Best regards

Mirko

 

 

 

 

-----Original-Nachricht-----

Betreff: [sumo-user] Question about Routing by Effort using SUMO

Datum: 2023-08-12T03:08:44+0200

Von: "James Cheng via sumo-user" <sumo-user@xxxxxxxxxxx>

An: "sumo-user@xxxxxxxxxxx" <sumo-user@xxxxxxxxxxx>

 

 

 

Dear SUMO staff members,

 

My main question is the following: how do we route by effort, where “effort” is travel time + toll? According to the documentation, it is recommended to use a weight file for routing by effort. However, my team and I have a couple questions about the weight file: 

  1. How do we encode our definition of effort into the weight file? Is it through the “traveltime” parameter?

Moreover, in the above weight file format, is “traveltime” a keyword that specifically encodes traveltime for the edge? Or can we put another variable name to represent our effort, such as “effort = 3” instead of “traveltime = 3”

  1. In addition, looking through the SUMO directory, we were unable to locate a formal definition of weights within the TAZ file and were wondering if you could help define it. According to SUMO documentation, the weight in the TAZ file is a “probability to use”, but is that an initial probability for a car to use that edge when we generate the simulation or is it iterative, in the sense that any time a car is confronted with that edge during the simulation, it has that probability to use the edge?

    1. In addition, what is the difference between the weights from the weight file vs the weights from the TAZ file?

  2. As a clarification, what would be the best way to route by effort? Do we use the weight file to route by effort or can we use the weights within the TAZ file to route by effort as well?

    1. Any examples of routing by effort, besides only travel time, using SUMO would be greatly appreciated!

 

Thank you so much for your help!

 

Best Regards,

James

 

 


 
--
James Cheng
B.A. Computer Science and B.S. Business Administration
University of California, Berkeley

 



Back to the top