/**
* Returns the first vehicle entered in the simulation. Since all vehicles depart from the same
* road, and SUMO lets at most one vehicle to depart from a given road at each step, the vehicle
* returned from this function will always be the same.
*
* @throws IOException
*/
public void getFirstVehicle() throws IOException {
Repository<Vehicle> repo = conn.getVehicleRepository();
while (repo.getAll().isEmpty()) conn.nextSimStep();
firstVehicle = repo.getAll().values().iterator().next();
}
