Multi-robot motion planning (MRMP) is the problem of finding collision-free paths for a set of robots in a continuous state space. The difficulty of MRMP increases with the number of robots due to the increased potential for collisions between robots. This problem is exacerbated in environments with narrow passages that robots must pass through, like warehouses. In single-robot settings, topology-guided motion planning methods have shown increased performance in these constricted environments. We adapt an existing topology-guided single-robot motion planning method to the multi-robot domain, introducing topological guidance for the composite space. We demonstrate our method's ability to efficiently plan paths in complex environments with many narrow passages, scaling to robot teams of size up to five times larger than existing methods in this class of problems. By leveraging knowledge of the topology of the environment, we also find higher quality solutions than other methods.
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