Hello, as was pointed out, the physical distance between vehicles is equal to the result of getLeader + minGap. Therefore a getLeader value of 0.001 likely belongs to a vehicle that is standing behind the leader vehicle in a jam or waiting at an intersection with the minGap spacing. Hence, the values are not strange at all. regards, Jakob
2017-07-27 9:49 GMT+02:00 Alessandro Virgilio via sumo-user < [email protected]>: > 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 <[email protected]> > Inviato: mercoledì 26 luglio 2017 17:23:09 > A: Alessandro Virgilio; [email protected] > 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 > > ------------------------------------------------------------ > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > sumo-user mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/sumo-user > > > > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > sumo-user mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/sumo-user > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ sumo-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/sumo-user
