The most likely causes is that this is purely visual:

https://sumo.dlr.de/docs/Simulation/Distances.html#vehicle_lengths_in_sumo-gui
Feel free to provide a minimal scenario example (
https://sumo.dlr.de/docs/FAQ.html#how_do_i_report_erroneous_behavior_of_a_sumo_application
)

Am Fr., 4. Nov. 2022 um 02:12 Uhr schrieb Chen Di <[email protected]>:

> Hi,
>
> I am running simulations in a ring road with all vehicles being rerouted.
> In my setting, vehicles with different types travel at different speed.
>
> When I observe the simulation, I noticed that sometimes two vehicles
> overlap. The faster vehicle just directly "cover" and pass the slow vehicle
> as if it does not exist.
>
> One of the possible reasons that I thought about is that vehicles
> traveling at different laps may fail to recognize its leader. For instance,
> at a same position in the ring, vehicle 1 may be traveling at its 1st loop,
> while vehicle 2 at the 2nd. When they encounter, the leader vehicle is not
> recognized because they are at different loops.
>
> If this is the case, how should I fix it (i.e., to enable vehicles
> recognize their leaders even if they have traveled for different number of
> loops)? If not, are there any other reasons that causes this and how should
> I solve them?
>
> Thanks in advance!
>
> Best,
> Cindy
>
>
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