// Parse the road network xml file
DocumentBuilder parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document roadNetworkXMLDocument = parser.parse(roadNetworkFile);
roadNetwork = (new RoadNetworkParser()).ParseXMLNetFile(roadNetworkXMLDocument);
// Initialize the layers
trafficLayers = new ArrayList<TrafficDefinitionLayer>();
// Create the job types array and add the default type