M31 may refer to:
==Roadways== M31 motorway, a planned but unbuilt motorway in England M-31 (Michigan highway), a former state highway in Michigan Hume Highway in Australia, designated "M31" M31 motorway (Hungary), a short motorway section near Budapest, Hungary M31 (Cape Town), a Metropolitan Route in Cape Town, South Africa M31 (Johannesburg), a Metropolitan Route in Johannesburg, South Africa M31 (Pretoria), a Metropolitan Route in Pretoria, South Africa M31 (Durban), a Metropolitan Route in Durban, South Africa
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).