are several instances where a route has officially been given a name by government agencies, and is signed with that name, but the route is also assigned a number by the highway maintenance agencies as to fit in their maintenance and inventory systems. Another common reason to not sign a highway is where the highway is government maintained, but is of little value to the general public.

Examples

Highway maintenance agencies with multiple numbering systems

*The C, D, and U road systems in the Great Britain road numbering scheme

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