Hello,
by default the lane changing algorithm uses very strict safety gaps and the
vehicles perform precise cooperative speed adjustments to achieve these
gaps. By setting a lower value for lcCooperative these adjustments fail and
lane-changing efficiency drops dramatically.

You have two options
1) set vType attribute lcCooperativeSpeed="1" (the lowered value of
lcCooperative will still reduce cooperative lane changing but the speed
adjustments take place as needed
2) set vType attribute lcAssertive="1.5". This lets vehicles change lanes
more aggressively (with reduced gap requirements). Of course you can use a
distribution rather than a fixed value here.

General notes:
- your scenario exposed a novel bug
https://github.com/eclipse/sumo/issues/7786 (now fixed) which was causing
"emergency braking" warnings for freshly inserted vehicles. The warnings
aren't critical but if you want to get rid of the noise, upgrade to the
development version tomorrow
- your scenario does not achieve the configured flow rate due to the
setting departSpeed="random". Whenever a slow vehicle is inserted, the flow
is reduced.  See
https://sumo.dlr.de/docs/Simulation/VehicleInsertion.html#investigating_insertion_delay

regards,
Jakob

Am Fr., 13. Nov. 2020 um 10:48 Uhr schrieb VictorKyriacou <
[email protected]>:

> I attached the whole scenario.
>
> Sumo.zip
> <http://sumo-user-mailing-list.90755.n8.nabble.com/file/t516/Sumo.zip>
>
>
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