How to find future RoadIDs for a car in Veins?

Question

In a scenario I am simulating in Veins, I need to determine for a car node it's next RoadID value. Since this information is stored in the .route file of the simulation, I think it can be extracted.

The current RoadID value can be returned by the traci->getRoadID() function. I explored how it extracts this ID and could go to that point where new modules are added by the addModule() function but I am unable to understand how it extracts this information.

Please help. Thanks in advance.

Answer 1

For future reference, as @user4786271 noted, this is currently not implemented in Veins 4 alpha 2, nor in SUMO 0.22.

The feature was added in ticket #1823 and is scheduled for addition in SUMO 0.24. The corresponding code to add support to Veins 4 will be:

int32_t TraCICommandInterface::Vehicle::getRouteIndex() {
    return traci->genericGetInt(CMD_GET_VEHICLE_VARIABLE, nodeId, VAR_ROUTE_INDEX, RESPONSE_GET_VEHICLE_VARIABLE);
}

Answer 2

As far as I know currently Veins does not have such a built-in feature. You can do something like getRouteId() for a certain vehicle. That will return you the route.

Next, within your application (.cc file) you can read the <example_name>.rou.xml of your current example which probably contains something like:

<route id="4" edges="0/1to1/1 1/1to2/1"/>

and from there you could infer the roadID, which in fact is the the name of the edge.

I know still the result would not be optimal.