Hello,
the simplest way to define a flow with a given rate is with the <flow>
element  (fixed and random insertion headways are possible):
https://sumo.dlr.de/docs/Definition_of_Vehicles%2C_Vehicle_Types%2C_and_Routes.html#repeated_vehicles_flows

The next step up is to define multiple flows to systematically vary the
arrival rate over time.

You can use netedit to define traffic (vehicles, trips, flows, ...)
graphically:
https://sumo.dlr.de/docs/Netedit/
https://sumo.dlr.de/docs/Netedit/editModesDemand.html#vehicle_mode

regards,
Jakob

Am Fr., 7. Jan. 2022 um 15:19 Uhr schrieb Ste Millington <
[email protected]>:

> Hi,
>
> I'm totally new to Sumo and trying to work out how to create a very simple
> microscopic simulation of traffic flowing through a set of lights.
>
> The simple setup I'm after is a single road (possibly with multiple lanes)
> with a set of lights midway along it. I want to send a stream of traffic
> down the road towards the lights. The traffic enters the system at random
> times but following an overall average flow rate. There may be a mix of
> different vehicle types of differing lengths and speeds.
>
> I want to be able to vary the flow rates and signal timings to observe how
> it affects queue lengths and average speed.
>
> I've successfully installed Sumo and managed to setup a simple network
> (without lights) with a fixed set of vehicles but I can't work out how to
> autogenerate a constant flow of traffic so I can analyse long term averages.
>
> Any help or pointers to relevant examples would be massively appreciated.
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