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Re: [sumo-user] some questions about rerouting in SUMO
1) "normal" vehicle was meant in contrast to trips (which already imply some routing)
2) random roll of the dice (unrelated to traffic situation). Think of this as the set of vehicles equipped with a live-traffic route finding software
3) option --verbose
4) it depends. We often use 300s in our projects
5) duarouter -r trips.xml -o routes.xml --weights.random-factor FLOAT
6) The "current traffic condition" is an average over past traffic states as explained at https://sumo.dlr.de/docs/Demand/Automatic_Routing.html. No equilibrium iteration is done for this.

Am Fr., 4. Sept. 2020 um 05:54 Uhr schrieb Jane Cheung <cheung180515@xxxxxxxxx>:

Jakob,

Thanks for your reply.

 More questions about the previous email.

1) the probability could be set in the range of (0,1], and <00 value means normal vehicles will not perform rerouting. 

  • What kind of vehicle is not the normal vehicle?  The the only scenario I know is to use Traci to reroute in the simulation.
  • If I set  <device.rerouting.probability value="0.5"/> and the s log.txt is printed as below:

 

Performance:

 Duration: 297822ms

 Real time factor: 18.1316

 UPS: 32080.783152

Vehicles:

 Inserted: 14158 (Loaded: 17538)

 Running: 2061

 Waiting: 3356

 

Does it mean SUMO would choose 50% of vehicles to have the ability of rerouting? 　

  • The vehicles are in terms of the inserted vehicles(14158) or the loaded ones(17538)？
  • How does SUMO decide which vehicle can reroute?
  • For example, edge A1B1 and edge B1A1  are 100m, the number of vehicles on edgeA1B1 is 18(edge A1B1 most in congestion), the number of vehicles on edge B1A1  is 6. The Sumo would choose 10 vehicles among  20 vehicles on edge A1B1 and 3 vehicles among 6 vehicles on edgeB1A1. Is that right? Obviously, traffic conditions in the two edges are different. Edge A1B1 is mostly in congestion, and vehicles on edge B1A1 can run in free-flow speed. More rerouting devices are assigned to vehicles on edge A1B1 might be a better choice. Could SUMO assign rerouting devices like that, or SUMO uses other more realistic strategies to choose which vehicle can reroute?
  • As explained in    https://sumo.dlr.de/docs/Simulation/Output.html#timing_data
  • How to let output printed the total time spend routing and average time per routing call?
  • According to your experience, the suitable frequency of calling rerouting is?

 

 

2) as you explained in 2), “all vehicles   <route-files value="casemy.trips.xml"/>when entering the simulation (pre-insertion rerouting uses the departure as the first routing time)  but no further rerouting takes place due to the high period.”

In my understanding,

  • if I use the trips   <route-files value="casemy.trips.xml"/> in .sumocfg file, the “reroute once” means route or generating the route    file firstly for inserted vehicles to let vehicles know edges they are scheduled to drive, and then, during the simulation the inserted vehicle will not reroute due to the high period;
  • if I have the trips file, how could I generate the route file randomly?
  • if I use the routes   <route-files value="casemy.rou.xml"/> in .sumocfg file, the “reroute once”  means reroute. In other words, ， SUMO will assign the fastest routes to all inserted vehicles according to the traffic condition at the inserted time point of vehicles.
  • Which algorithm does SUMO use to find the fastest routes when vehicles are going to enter into the simulation? The user equilibrium model, such as call duarouter.exe run in 50 interaction or other ones?

Appreciated in advance!

Best regards,

Jane Cheung

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