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Related sign codes and signs:
- M1-1 identifies Interstate Highway shields.
- M1-2 identifies Interstate Business Loop shields.
- M1-3 identifies Interstate Business Spur shields.
- M1-4 identifies U.S. Route shields. For other countries, national government routes, like the Trans-Canada Highway, would go here.
- M1-5 identifies State Route (highway) shields. For other countries, provincial routes, like Nova Scotia Highway 101, would go here.
- M1-6 identifies County Road shields. For other countries, local government routes, like York Regional Road 69, would go here.
- M1-7 identifies Forest Route shields.