Hello,
there is nothing that would give aggregated traffic data around a moving
observer.
However, you can get disaggregated data in these ways
- post-simulation output:  --fcd-output with option --device.fcd.radius
(only observer should be equipped with an fcd device)
- online retrieval: traci.vehicle.subscribeContext
https://sumo.dlr.de/docs/TraCI/Interfacing_TraCI_from_Python.html#context_subscriptions
- post simulation output if only a portion of the fleet should be
observable: https://sumo.dlr.de/docs/Simulation/Bluetooth.html

regards,
Jakob

Am Di., 6. Okt. 2020 um 00:26 Uhr schrieb Hao Zhou <[email protected]>:

> Hi SUMO community,
>
> I'm interested in an efficient, real-time method to retrieve aggregated
> traffic measures around a moving observer. The fixed detectors are not very
> handy because I want to know the densities (or speed) at the upstream and
> downstream of a moving observer (car), as shown by the figure below. Those
> aggregated info are ideally meaured in road cells with lengths between
> 30m~60m.
>
> Anyone can share some neat ideas?
>
> Thank you in advance,
>
> Hao Zhou,
> Georgia Tech
> [image: moving observer.png]
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