In the framework of SUMO, demand generation means essentially the generation of traffic participants (persons and/or different types of vehicles ) and the generation of a route for each traffic participant. It is recommended to start with demand generation only after the network has been edited. In any case it is good practice to save a scenario with the network only (without demand info).
All available vehicle types[1] can be browsed and modified under:
scenario.demand.vtypes
Note that each vehicle type belongs to a vehicle class, also called modes.
The different demand generation methods, as described below, will generate trips and routes, which can be browsed in
scenario.demand.trips and scenario.demand.trips.routes
The currently implemented demand generation methods are:
- Zone to zone demand flows
- Turn flows
- Virtual Population
The different demand generation methods can be used in combination: For example trips generated with method Zone to zone demand flows can be simulated together with the demand generated with the Virtual Population method.
- Of course in a traffic scenario we have usually more than one participant of each type