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Street Traffic draws on OpenStreetMap for geometry and TomTom for flow, and the row said "Road data temporarily unavailable" whichever one failed. The reporter of #661 went and verified a TomTom key while every public Overpass mirror was refusing their network with HTTP 406 — a status fetchRoads already had and dropped on the floor. Classify the refusal where the layer talks to Overpass: 429 is "Overpass rate-limited", 504 is "Overpass timed out", anything else is "Overpass refused the road query (HTTP <status>)". The first two are the words alpr's Overpass source already uses; the status is what says which upstream declined, which a single-source layer never has to. The error carries its status as a RoadRequestError, following LiveSourceError in src/sources/live/contract.js, so a caller can branch on the code without parsing English. The catch promotes a classified refusal and keeps the general line for everything else — the branch is on the error type, not on its text, because a dropped socket throws whatever the platform felt like saying and "Failed to fetch" on a panel row helps nobody. Retries, backoff, caching and the mirror rotation are untouched.