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Re: [sumo-user] Collisions even with collision avoidance?
laneChangeMode 256 permits to create a dangerous situation. If the situation is sufficiently dangerous, the default vehicle behavior will not prevent collisions.
If you want to avoid collisions, either use 512 or perform some additional checks on the front and back gaps so that other vehicles will not "overract". (undercutting the safe gaps by a little bit is usually not a problem). You can compute safe gaps with traci.vehicle.getSecureGap.

Am Do., 31. März 2022 um 11:21 Uhr schrieb Hriday Sanghvi via sumo-user <sumo-user@xxxxxxxxxxx>:
Thank you for the quick response. Since the speed mode is by default 31 (all checks ON), would that not prevent this type of collision ? Or is the only way to ensure it is collision-free is by setting the Lane changing mode to 512 (minimum). The use case mentioned is for when TraCI takes control over vehicle speeds and if there is some level of cooperation from how TraCI is changing those speeds - if I understood that right?

Thank you.

Sincerely,
Hriday

On Thu, 31 Mar 2022 at 09:49, Jakob Erdmann <namdre.sumo@xxxxxxxxx> wrote:
'immediate' collisions refer to collisions in the lane-changing step. Mode 256 only prevents lane-changing if there is a car adjacent to the ego car (longitudinal overlap).
Mode 512 also ensure "secure" gaps with regard to car-following. This ensures that all cars can keep driving without emergency braking.
The main use case for mode 256 assumes taking control over vehicle speeds for "dangerous" maneuvers that are still safe as long as all vehicles cooperate.


Am Do., 31. März 2022 um 10:16 Uhr schrieb Hriday Sanghvi via sumo-user <sumo-user@xxxxxxxxxxx>:
Hello,

I may have misunderstood the lane change modes. Setting lane change mode to 256 (collision avoidance) should prevent any 'immediate' collisions in the simulation. But here I have a collision in this run with the vehicle in front emergency braking and hitting the vehicle in the back. My car following model is Krauss and lane changing model is SL2015.

collision256-marked.png
When I set lane change mode to 512 (collision avoidance and gap enforecement), there is no collision. Please advise.

Thank you.
Sincerely,
Hriday.
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