def destroy(self):
        """
        Destroy all lanes in this road network
        Returns: None

        """
        super(EdgeRoadNetwork, self).destroy()
        if self.graph is not None:
            for k, v in self.graph.items():
                v.lane.destroy()
                self.graph[k]: lane_info = None
            self.graph = None

        Destroy all lanes in this road network
        Returns: None

        
metadrive/component/road_network/edge_road_network.py