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Webinar Question and Answer Transcript

A Digital Twin for Traffic Monitoring & Proactive Incident Management
(May 11, 2021)

T3 and T3e webinars and T3e webinars are brought to you by the Intelligent Transportation Systems (ITS) Professional Capacity Building (PCB) Program of the U.S. Department of Transportation’s (USDOT) ITS Joint Program Office (JPO). References in this webinar to any specific commercial products, processes, or services, or the use of any trade, firm, or corporation name is for the information and convenience of the public, and does not constitute endorsement, recommendation, or favoring by the USDOT.


Was data segregated by type when collecting and using vehicle counts in the model? And was it in PCU?


Dr. Jun Liu: Yes. Actually we are using for this project, we are using interactive lobe detect account and because of the process of the intersection. So they’re probably going to use some like vehicle data hub and some other source of data into our method and making the motor carrier bigger.


For the SUMO traffic flow estimation. How well is your study area covered by detectors?


Xing Fu: Currently we are using the counts from the loop detectors. We plan to apply the Wejo and float vehicle in the short future and for detectors, currently the detectors are deployed mostly at the approaches of the intersections and some are on the corridors.

Dr. Jun Liu: For the current network or most of the network, they’re deployed at the intersectional project and there are a number of the detectors that are on the midstream of the corridor and this is not fully covered in the network.

Unknown: That’s why we need to develop this dissemination. If we have the detectors covering all these sites and linked, we may not need an examination. And also some roads, maybe some names we’ve detected some of the names that don’t have detectors and with time to use this to kind of dissemination prepare us for the movement and vehicles accounts in those names and roads names we don’t have the conference made detectors with cameras.


Are the BSMs being received in real time—what media? DSRC or C‐V2X in 5.9?


Dr. Alex Hainen: They will vary on the intersections we are doing, the one we are focusing on is the infrastructure base with the radar placing them into the controller over the connected vehicle coprocessor. From working with manufacturers, I believe that they are seeing the detection will no longer be a binary on and off zone call rather that it will be objects that are tracked and use that way. The DSRC we’ve deployed around here with Federal Communications Commission (FCC), things are in a weird limbo state. We are looking the next appointment out on the freeway and we have a cellular vehicle to network that goes over the cell grid and we have 900 megahertz radio, so it depends on what the application that we are trying for is. We are traffic folks, we are not electrical engineers or radio manufacturers or engineers, so for us, we are more concerned that the controller operational level with the data that’s coming in… “How do we use it?”, and “what we get from a traffic standpoint”. I’m not really interested in the radio part of it, it’s not very exciting. One person will say one thing and the other. So we would rather not make the claim like that. So it’s just whoever, Federal Communications Commission (FCC) or the other one at each (Federal Highway Administration) FWHA, whoever is winning the battle, we try to play in those guidelines.


Do you have all the sources and sinks covered, or the network is partially covered?


Xing Fu: No they are not…actually, we assume that the detectors close to the end of the network to be the possible sinks and sources. When you define the sink and source using DFRouter, the vehicle just showing up at the detector locations.

Dr. Jun Liu: I think I would say it’s like possibly covered. But with our method [indiscernible] and of the network and close to the end of the network, you can assume they’ve come to be [indiscernible] so based on these things, I think that there sorted by using this to control the total number of the import into the network. So this is how we do the things, this is how we deal with the things.

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