No. To disable strategic laneChanging completely, you can either - set laneChangeMode - or set lcStrategic="-1"
because only setting lcStrategic="0" still allows changing at the end of the lane. b) lcSpeedGain="0" still is equivalent to lcSpeedGain="0.001" in version 1.13.0 but disables changing for speedGain completely in the development version (https://github.com/eclipse/sumo/issues/10709) c) lcCooperative="0" prevents cooperative changing if there is any inconvenience. However, if you set lcSpeedGain="0" lcCooperative="0" a vehicle might still perform a cooperative change if the target lane affords higher speed. To achieve the same affect as disabled-via-lane-change-mode you can set lcCooperative="-1" (again, this requires the dev version) regards, Jakob Am Do., 12. Mai 2022 um 08:49 Uhr schrieb Hriday Sanghvi via sumo-user < sumo-user@eclipse.org>: > Hello Jakob, > > Thank you for the update. So if I understand correctly: to completely > disable strategic lane changing by SUMO, I have to > 1. set the laneChangeMode bits 0 and 1 (for strategic lane changes) to 0 > AND also > 2. set lcStrategic to -1 in my routes files for the vType > Because only setting relevant laneChangeMode bits and then setting > lcStrategic=1 may still allow strategic lane changes at the end of the lane? > > Is this also true for lcSpeedGain and lcCooperative? Since there are also > changes in behaviour when I isolate lcCooperative parameter (keeping > lcStrategic and lcSpeedGain fixed at 1), i.e., > a. when I set laneChangeMode bits 2 and 3 to 0, and set lcCooperative to 1, > vs. > b. when I set laneChangeMode bits 2 and 3 to 0, and set lcCooperative to 0, > > I would have expected a. and b. to give me the same behaviour/time to > complete the simulation, since I believe laneChangeMode completely disabled > certain types of lane changes - but it seems that the lcParams still have > some effect. Please advise. > > Thank you. > > Sincerely, > Hriday > > > On Thu, 12 May 2022 at 06:36, Jakob Erdmann <namdre.s...@gmail.com> wrote: > >> The key difference is that the laneChangeMode completely disables >> strategic lane changing whereas lcStrategic="0" only sets the strategic >> lookahead distance to the minimum possible value. Vehicles will still >> perform a strategic laneChange when reaching the very end of their lane. >> You can set lcStrategic to a negative value to disable strategic lane >> changing completely but this was (until now) undocumented. >> >> regards, >> Jakob >> >> Am Di., 10. Mai 2022 um 19:11 Uhr schrieb Hriday Sanghvi via sumo-user < >> sumo-user@eclipse.org>: >> >>> Hello again, >>> >>> I use *lc_params* to refer to the 3 parameters lcStrategic, >>> lcCooperative, and lcSpeedGain in the previous email, and *lc_mode *to >>> refer to the lane changing mode. To clarify, here are some experimental >>> results for each case for 100 vehicles on a 1000 m road with 2 free lanes >>> (NO blockages): >>> +-----------------+---------+------+ >>> | *lc_params* | *lc_mode* | *Time* | >>> +-----------------+---------+------+ >>> | Set to 1 | 512 | *241* | >>> +-----------------+---------+------+ >>> | Unset (default) | 512 | *241* | >>> +-----------------+---------+------+ >>> | Set to 0 | 512 | 172 | >>> +-----------------+---------+------+ >>> | Set to 1 | 1621 | *204* | >>> +-----------------+---------+------+ >>> | Unset (default) | 1621 | *204* | >>> +-----------------+---------+------+ >>> | Set to 0 | 1621 | 218 | >>> +-----------------+---------+------+ >>> >>> As seen from the table, Regardless of whether the lc_params are set to >>> their default value (1) explicitly, or if they are unset (default value is >>> used), the result (time in steps) of the simulation stays the same in both >>> cases of the lc_mode (512 and 1621). This is in line with my understanding. >>> However, when the lc_mode is set to 512, lc_params should in fact make no >>> difference since the behaviour controlled by these lc_params were already >>> deactivated - namely, do no strategic changes, do no cooperative changes >>> and do no speed gain changes. >>> >>> So what I gather is that there is some form of hierarchy - Which >>> parameter do I set to overwrite the other no matter what? Or why would >>> setting lc_params to 0 in the case of lc_mode = 512 make a difference? >>> >>> Thank you. >>> >>> Sincerely, >>> Hriday >>> >>> On Tue, 10 May 2022 at 14:01, Hriday Sanghvi <sangh...@tcd.ie> wrote: >>> >>>> Hello, >>>> >>>> *My belief*: The lane change mode 512 is supposed to disable all >>>> autonomous lane-changing except for safety-gap enforcement and collision >>>> avoidance. So setting lcSpeedGain=0 or lcStrategic=0 should be pointless, >>>> since that is the same effect achieved by setting lane change mode to 512, >>>> since bits 0 through 6 are all set to 0 : do no strategic changes, do no >>>> cooperative changes, do no speed gain changes, do no right drive changes; >>>> >>>> *Discovery*: When I set *lcStrategic=0, lcCooperative=0, and >>>> lcSpeedGain=0* on my vType anyway as such: >>>> <vType lcStrategic="0" lcCooperative="0" lcSpeedGain="0" carFollowModel >>>> ="Krauss" color="0,1,0" id="veh" latAlignment="center" lcKeepRight="0" >>>> lcLookaheadLeft="1" lcOvertakeRight="1" lcSpeedGainRight="1" length="5" >>>> sigma="0" speedDev="0" speedFactor="1.0" /> >>>> The behaviour seems to have changed drastically. >>>> >>>> With an LC mode of 512, >>>> *1. Without setting the 3 lcParams*, it takes 100 vehicles *477s *to >>>> reach the end of a 1000m road with 2 lanes, with a small blockage from (500 >>>> - 750m) on one of the lanes. >>>> *2.* *Setting the 3 lcParams, *it takes the same only *262s* >>>> >>>> *Doubt:* Am I misunderstanding what autonomous lane-changing means? Or >>>> are the two: lcParams and lane change mode not equivalent in the way I have >>>> mentioned? >>>> >>>> Please advise. >>>> >>>> Thank you. >>>> >>>> Sincerely, >>>> Hriday >>>> >>> _______________________________________________ >>> sumo-user mailing list >>> sumo-user@eclipse.org >>> To unsubscribe from this list, visit >>> https://www.eclipse.org/mailman/listinfo/sumo-user >>> >> _______________________________________________ >> sumo-user mailing list >> sumo-user@eclipse.org >> To unsubscribe from this list, visit >> https://www.eclipse.org/mailman/listinfo/sumo-user >> > _______________________________________________ > sumo-user mailing list > sumo-user@eclipse.org > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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