Thanks for your reply. It sounds good. Mirko Barthauer <[email protected]> 于2023年7月27日周四 04:59写道：
> Hi Yu, > > > > you are completely right. Thank you for looking closely into this part of > SUMO. The induction loop detector length feature has been retrofitted last > year but the speed formula hadn't been updated. This has been corrected and > you can either build fresh SUMO binaries from Github source or wait for > tomorrow's development binaries > <https://sumo.dlr.de/docs/Downloads.php#sumo_-_latest_development_version> > to try it out. > > > > Best regards > > Mirko > > > > > > > > > > > > -----Original-Nachricht----- > > Betreff: [sumo-user] Another possibly severe problem of induction loops in > SUMO > > Datum: 2023-07-27T06:12:05+0200 > > Von: "Ludwig Tang via sumo-user" <[email protected]> > > An: "Sumo project User discussions" <[email protected]> > > > > > > > Hi all, > > I have one concern about speed data from induction loops. In the default > setting, SUMO set the length of induction loops as 0 meter, while in > practice the length usually equals around 2 meters. I find that in SUMO > induction loop lengths could significantly affect speed measurements. > Admittedly, the length may have impacts on observations. I expect the > impacts are minor, but it seems not in SUMO. Attached are my > experiment results. I considered free-flow traffic on one lane. Clearly, > the flow measurements are similar, but the speed data significantly drop > with an increase of length of induction loop sensor. I can't understand > this phenomenon. Can anyone explain this? I also attached a zip file > containing the simulation files and the code. > > Best wishes, > Yu > > > >
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