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Re: [sumo-user] Questions about Gap between two vehicles and getLeader method
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Hi Michael,
in my previous tests I used the default car following model (carFollowing-Krauss)specifing the mingGap as minGap = "1" and in some circumstances I got this values from the getLeader method.
39.04120129
30.80244446
22.25698386
12.35251871
5.246203698
1.330938864
0.028784268
0.008626148
0.001707736
0.001297148
0.001090875
0.001022937
0.001010266
0.001003249
0.001000934
0.00100031
0.001000016
0.001000008
0.001000001
0.001
0.001
0.001
0.001
0.001
After the last value, the leader disappeared and i didn't get any result from getLeader method, as it is defined.
Besides, I noticed that the streak of these "strange" values is often short, less than 15/20 steps.
I tried the original Krauss car following model (attribute=KraussOrig1) but I obtained worse results. In particular the distance is quite always under the specified gap.
Should I try some different car following models?
Thank you.
Regards,
Alessandro
________________________________
Da: Michael Behrisch <oss@xxxxxxxxxxx>
Inviato: mercoledì 26 luglio 2017 17:23:09
A: Alessandro Virgilio; sumo-user@xxxxxxxxxxxxxxxxxxxxx
Oggetto: Re: [sumo-user] Questions about Gap between two vehicles and getLeader method
Hi Alessandro,
if you use the default Krauss model the vehicles should always respect
the minGap except for rare circumstances which trigger emergency
breaking (missing or short yellow phases in traffic lights for
instance). Can you send a small example?
Best regards,
Michael
Am 26.07.2017 um 11:00 schrieb Alessandro Virgilio via sumo-user:
> Hi, I have a question about the minGap attribute and the output given by the method getLeader in Traci for python.
>
>
> I defined two vehicle types, giving some attributes and the mingap. Then, for each simulated vehicle, I extracted the distance with the leading vehicle, using the method getLeader.
>
>
> Sometimes it happens that the distance with the leading vehicle is less than the specified minGap. I can't understand if it's a bug or I misunderstood the meaning of the minGap attribute. Is it applied only with vehicles stuck in traffic jam? In this case, is there any way to define a minum distance to keep for each vehicle during the simulation?
>
>
> Using sumo 0.30.0 and python 2.7
>
> Thank You.
>
>
> Regards,
> Alessandro V
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