Re: [sumo-user] Variable traffic flows, density and arrival times

[Mirko Barthauer <m.barthauer@xxxxxxxxxxx>]

Hi Hriday,

 

you have to insert single vehicle in TraCI, as there is no option to manipulate flows there. The number of vehicles you can insert depends on the number of lanes, the chosen car-following parameters, the departure speed, the time step length, ... You can insert at most one vehicle per time step and lane. The road capacity is influenced  by the lane count, the vehicle length and the minimum distance between vehicles according to your car-following settings.

 

Best regards

Mirko

 

 

 

-----Original-Nachricht-----

Betreff: [sumo-user] Variable traffic flows, density and arrival times

Datum: 2024-01-06T13:13:39+0100

Von: "Hriday Sanghvi via sumo-user" <sumo-user@xxxxxxxxxxx>

An: "Sumo project User discussions" <sumo-user@xxxxxxxxxxx>

 

 

 

Hello,

 

I was trying to implement dynamic flows where I wanted to change the vehsPerHour mid-simulation.

Example flow:
<flow arrivalLane="current" arrivalPosLat="center" begin="0" departLane="random" departPosLat="center" departSpeed="max" id="flow_btt" number="100" route="bottom_to_top" type="veh" vehsPerHour="6000" />

 

I couldn't find a way to dynamically set/update flows using TraCI, so I assume I have to add vehicles using TraCI to simulate a particular type of flow?

 

1. So if I wanted to insert vehicles at a rate of 6000 vehs/Hour, I need to insert 6000 / (60 x 60) = 1.6667 vehs/Second or 2 vehs/Second? (assuming 1 second = 1 TraCI simulationStep()?

 

2. There seem to be limitations to 1. For example, if there is a road with only a single lane, then there is a maximum vehicle flow that it can tolerate, beyond which there is no effect. Is that correct? So I would have to have multiple lanes to increase the flow?

 

3. Assuming 2 is correct, since 1 lane cannot have a flow higher than 1 vehs/Second, I will need as many lanes 'x' to accommodate the desired flow [x] vehs/Second? If not, then what are the other ways apart from increasing number of lanes that can increase the capacity of the road to tolerate more vehsPerHour or flow?

 

Please advise.

 

Thank you,

Sincerely,

Hriday