| Re: [sumo-user] Vehicles Running Over Each Other During SUMO Simulation |
Thanks for your response, Jakob.The problem with reducing lcAssertive to smaller values as it seems to me is that in some cases merging vehicles coming from on-ramps won't find a long enough gap to merge before the end of the acceleration lane, and this creates a repetitive stopping and bottleneck instances downstream of merging segments. I noticed that even if I set high values for lcStrategic this problem keeps happening. I thought this is probably linked to the min gap parameters, but I'm using the default tau(which I believe is low enough) and here are my parameters for the car following and lane changing models. Do you see any other sources of trouble?One other problem that I'm facing is lateral instability. I am not sure if this is the correct term, but basically in some occasions vehicles tend to perform a series of lane changes within a few seconds time frame, especially upstream of the location of the major bottleneck location (interchange) in the freeway I'm simulating . It looks as if these vehicles(drivers) are hesitant and cannot decide which lane to drive in. I think in most cases the cause of those abrupt lane changes is the LcSpeedGain parameter. However, this parameter has proved vital in getting vehicles to shift to lanes with less traffic density when being in a more congested lane. I'm attaching a short recording which displays this problem. Any thoughts?Best regards,Ahmad Abdallah._______________________________________________On Thu, Feb 17, 2022 at 11:33 AM Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:lcAssertive 30 is quite likely to cause this. It reduces the acceptable gap size by a factor of 30 and thus causes lane-changing into short gaps that are very unsafe.I'd recommend keeping lcAssertive well below 2 (though even a value of 1.1 may cause collision in exceptional circumstances)._______________________________________________Am Do., 17. Feb. 2022 um 16:09 Uhr schrieb Ahmad Abdallah via sumo-user <sumo-user@xxxxxxxxxxx>:_______________________________________________Hello,
While running a simulation in SUMO, I am facing a problem which is that vehicles are colliding and running over each other when changing lanes, as shown in the attached picture. Do you have any idea how I can solve this problem? Could it be due to high LcAssertive value? I am currently using 30.
To give more context, I just disabled the teleporting when colliding option. So now I only get warnings when vehicles collide and no teleporting is done except in instances of gridlocks.
Best regards,Ahmad Abdallah.
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