Arrangements responsive to adverse atmospheric conditions, e.g. to signal icy roads or to automatically illuminate in fog; Arrangements characterised by heating or drying means

Full Title

Arrangement of road signs or traffic signals; Arrangements for enforcing caution (for obstructing or restricting traffic E01F13/00) > Arrangements responsive to adverse atmospheric conditions, e.g. to signal icy roads or to automatically illuminate in fog; Arrangements characterised by heating or drying means