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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