Vehicles collide and pile up in 3lane_cut_in scenario

[qianlin04]

Problems
I find that in 3lane_cut_in scenario vehicles often collide then pile up in the way. In some cases, this problem makes it even impossible for agent to cross the obstacle to reach the goal.

In the meantime, the following errors raised:

Agent_0: Collided.
ERROR:root:TraCI has disconnected with: Vehicle 'actor-car--2361632437743525594-317' is not known
WARNING:SumoTrafficSimulation:attempting to transfer SUMO vehicles to other providers...
Agent_0: Collided.
 Retrying in 0.05 seconds
Agent_0: Collided.
ERROR:root:TraCI has disconnected with: Vehicle 'actor-car--2361632437743525594-380' is not known
WARNING:SumoTrafficSimulation:attempting to transfer SUMO vehicles to other providers...
Agent_0: Collided.
 Retrying in 0.05 seconds
ERROR:root:TraCI has disconnected with: Vehicle 'actor-car--2361632437743525594-407' is not known
WARNING:SumoTrafficSimulation:attempting to transfer SUMO vehicles to other providers...
...

I wonder if there is something wrong and if changing parameters in scenoria.py can solve the problem. Appreciate for anyone's kind response !

[qianyi-sun]

Hello @dolts4444 , thank you for reporting this issue!
We have been aware this issue and put up a fix (see PR #1628) for it, we will merge this to develop and comp-1 branch asap.

[Gamenot]

The fix has been added to the competition branch (comp-1) that prevents pile-ups. There may be a slight coming in #1630 because we were made aware that the traffic behaviour could be exploited in a way we did not expect.

[qianlin04]

@qianyi-sun @Gamenot Thanks a lot for your help.

[Adaickalavan]

We hope the above addresses your question and thus this issue is being closed. Please feel free to reopen this issue if your problem persists or open a new issue for other questions.