def get_all_lanes(self):
        """
        This function will return all lanes in the road network
        :return: list of lanes
        """
        ret = []
        for id, lane_info in self.graph.items():
            ret.append(lane_info.lane)
        return ret

        This function will return all lanes in the road network
        :return: list of lanes
        
metadrive/component/road_network/edge_road_network.py