thanks for your answer
there are still some questions
1。 duarouter use incomplete trip/flow file ,net xml file ,weight file and 
additional file to generate complete route file 。 right?
2  weight is generated from additional  file  with <edgedate>/<lanedata> 
element。  right?
3 if 2 is right , which application can use additional file to generate weight 
file

thank you for help me :)

发自网易邮箱大师

在2017年12月06日 04:16,Jakob Erdmann<mailto:[email protected]> 写道:
Hello,
1) the travel time of an edge usually equals it's length divided by it's speed 
limit. The actual speed of any one vehicle may differ  from the speed limit and 
thus the travel time may be different as well. See 
http://sumo.dlr.de/wiki/Simulation/VehicleSpeed
2) the 'stored travel time' of a lane you can see in sumo-gui, is a way to 
customized the travel time values that are used when re-routing vehicles within 
the simulation (http://sumo.dlr.de/wiki/Simulation/Routing).
3) see 
http://sumo.dlr.de/wiki/Demand/Shortest_or_Optimal_Path_Routing#Custom_edge_weights
 and
http://sumo.dlr.de/wiki/SUMO#Format_of_additional_files

regards,
Jakob

2017-12-05 15:01 GMT+01:00 杜 伟强 
<[email protected]<mailto:[email protected]>>:
Hello :
I’m getting trouble in travel time.
1 .what is the definition of travel time
2. I see travel these words in user doc
       Usually, each road within a simulation has an assigned travel time based 
on its length and allowed speed.

but when I right click show parameter in sumo-gui,every lane’s travel time is -1

3. how to set travel time in .xml file? I find this parameter is set in weight 
file. But maybe weight file is generate by additional file. How to generate 
weight file. Is there an example file? What is the relationship between weight 
file and additional file

I was bothered by these problem so long time.
Any one can help me ?
Thank you so much
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