}
public void previewPressed() {
try{
RoadMap map = null;
RoadMapFactory fact = RoadMapFactory.getInstance();
map = fact.makeRoadMap(Integer.parseInt(crossCount.getText()) , Integer.parseInt(crossCount.getText()) , Integer.parseInt(crossCount.getText()));
TrafficRegister.getInstance().setRoadMap(map);
VehicleRegister reg = null;
VehicleRegisterFactory factory = VehicleRegisterFactory.getInstance();