/// <summary>
        /// Imports traffic volume from older file versions still containing "Aufträge"
        /// </summary>
        /// <param name="fahrauftraege">List of all "Aufträge" to import</param>
        public void ImportOldTrafficVolumeData(List <Auftrag> fahrauftraege)
        {
            foreach (Auftrag a in fahrauftraege)
            {
                BunchOfNodes startBof       = GetOrCreateEqualBoF(a.startNodes, startPoints);
                BunchOfNodes destinationBof = GetOrCreateEqualBoF(a.endNodes, destinationPoints);

                TrafficVolume tv = GetOrCreateTrafficVolume(startBof, destinationBof);
                switch (a.vehicleType)
                {
                case CityTrafficSimulator.Vehicle.IVehicle.VehicleTypes.CAR:
                    tv.SetTrafficVolume((int)(tv.trafficVolumeCars + a.trafficDensity * 0.92), (int)(tv.trafficVolumeTrucks + a.trafficDensity * 0.08), tv.trafficVolumeBusses, tv.trafficVolumeTrams);
                    break;

                case CityTrafficSimulator.Vehicle.IVehicle.VehicleTypes.BUS:
                    tv.SetTrafficVolume(tv.trafficVolumeCars, tv.trafficVolumeTrucks, tv.trafficVolumeBusses + a.trafficDensity, tv.trafficVolumeTrams);
                    break;

                case CityTrafficSimulator.Vehicle.IVehicle.VehicleTypes.TRAM:
                    tv.SetTrafficVolume(tv.trafficVolumeCars, tv.trafficVolumeTrucks, tv.trafficVolumeBusses, tv.trafficVolumeTrams + a.trafficDensity);
                    break;
                }
            }

            OnStartPointsChanged(new StartPointsChangedEventArgs());
            OnDestinationPointsChanged(new DestinationPointsChangedEventArgs());
        }
 /// <summary>
 /// Stores the traffic volume into the current TrafficVolume record.
 /// </summary>
 private void UpdateTrafficVolume()
 {
     if (m_currentVolume != null && !ignoreUpdateEvent)
     {
         m_currentVolume.SetTrafficVolume((int)spinCarsVolume.Value, (int)spinTruckVolume.Value, (int)spinBusVolume.Value, (int)spinTramVolume.Value);
     }
 }