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Re: [sumo-user] Using lane area detectors to measure queue length at on-ramps
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Yes. Halting vehicles and jammed jammed vehicles are synonymous in the context of the E2 detector.
Hi Jakob,
Thanks for your reply. How can I address it if I want to have access to the distance from the start of the first jam to the end of the last jam? I have noticed the speed threshold for lane area detectors, which has something to do with halting vehicles. Is it also related with jam? How dose SUMO determine whether a vehicle is in jam? Possibly I can set a high threshold so that vehicles in low speed between jams can be recognized to be in jam as well.
Best,
Yu
if the detector is long enough It can have more than one distinct jam at the same time. Thus the sum of jam lengths will be different from the maximum.
Hi all,
I am using lane area detectors to measure queue length at on-ramps that are regulated by ramp meters. I set both the simulation step size and the period of lane area detectors equal to one second. It is not surprising to find that "meanMaxJamLengthInMeters" and "maxJamLengthInMeters" have the same values, but it is confusing to find that "jamLengthInMetersInSum" can have different values. In my opinion, it should have the same values since the simulation step size is equal to the period of lane area detectors.
Besides, I also tried to access the queue length via Traci. The method getJamLengthMeters() of lane area detectors provides the values that the same as "jamLengthInMetersInSum" does.
Can anyone explain the differences between "jamLengthInMetersInSum" and "maxJamLengthInMeters" when both the simulation step size and the period of lane area detectors are equal to one second?
Best,
Yu
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