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Re: [sumo-user] Vehicle Route Conconation

Hi Sven,

it would be rather similar to the repeated loop concept in the sense that it is merely some parsing/generating code before the simulation starts. I imagine this is similar to what you do now externally.

  • define / load shorter routes first
  • define a new route which refers to a sequence of previously defined routes in a special attribute "concatenate" (maybe there is a better name)
    • when parsing the route, check for the attribute "concatenate"
    • look up the referred routes, return an error if they cannot be found or cannot be joined through the common last/first edge
    • otherwise get the edges of the routes and join, adapting until values

Best regards,
Mirko

Am 01.07.2026 um 19:36 schrieb Sven:
Hi Mirko,

thank you for your response.
Im afraid looping and flows are not suited for my goal of simulating persistent vehicles operating accoarding to multi-line schedules.

Your Idea for a "conconation" attribute however sounds very interesting. 
How would that work? Could you elaborate on that?
If there is a way for me to implement a functionality like that myself, id be very willing to put in the time.

Best regards
Sven




-------- Original Message --------
On Wednesday, 07/01/26 at 19:26 Mirko Barthauer via sumo-user <sumo-user@xxxxxxxxxxx> wrote:

Hi Sven,

 AFAIK there is currently no such thing like creating a new route from 2+ arbitrary route building blocks internally or even keeping a list of routes to take one after another. As it seems just another way of defining routes, this may be possible to implement. I'd rather define a new attribute "concatenate"  where the building blocks can be put so there is no confusion whether there are routes and edges of the same name.

However if you have bus services repeatedly serving the same line (both directions), you can make it a looped route (see docs). That way you can define it once and then set the repeat attribute (which internally will make sumo copy the route edges).

Best regards,
Mirko

Am 01.07.2026 um 17:40 schrieb Sven via sumo-user:
Dear SUMO-Community,

my name is Sven, ive written here before, a few weeks ago. I have since continued to work on a project concerning the charging behaviour of electric buses.

Many thanks to Moritz Schweppenhäuser, i really like your work and your scenario is very helpful to me.

However, i seem to have hit a blockade within my own approach of simulating.
While SUMO provides routes, flows and some interaction via TraCI, there seems to be no supported way of having vehicles use what id call "modular routes".

For my bus-simulation, it would be ideal to have vehicles perform their service one route after another, by providing a list of pre-defined routes, to then have a vehicle perform multiple of these, one after another:

<routes>
    <vType id="bus" vClass="bus"/>
    <route id="161_A" color="" edges="A B C">
        <stop busStop="X1" duration="20.0" until="20.0" parking="true"/>
        <stop busStop="X2" duration="20.0" until="80.0" parking="true"/>
    </route>
    <route id="161_B" color="" edges="C D E">
        <stop busStop="X3" duration="20.0" until="20.0" parking="true"/>
        <stop busStop="X4" duration="20.0" until="80.0" parking="true"/>
    </route>
</routes>
<routes>
    <vType id="type1" accel="0.8" decel="4.5" sigma="0.5" length="5" maxSpeed="70"/>
    <vehicle id="0" type="type1" route="161_A 161_B" depart="0" color="1,0,0"/>
    <vehicle id="1" type="type1" route="161_B 161_A" depart="0" color="0,1,0"/>
</routes>
My current plan is to generate new routes from these partial-routes beforehand, but this requieres a lot of effort, of calculating possible combinations, and "until" values, for potentially many hundred routes.
I am therefore asking, wether there are more convinient ways to achive what im planning, or if such a feature could potentially be implemented sometime.
Best regards
Sven

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