page_title: Inner–outer directions
section_title: Examples
hierarchical_section_title: Inner–outer directions / Examples
caption_attribution_description: English: Sign for the Boulevard Périphérique (en, fr) around Paris, France.
context_page_description: Inner–outer directions are labels that identify the direction of travel on opposing lanes of traffic on certain ring roads or beltways. They can be used to sign individual routes that encircle a city or metropolitan area, where east–west and north–south orientations cannot be applied uniformly. The labels are also used in select double track rail systems that form a loop, indicating the direction of travel of each line.
  Variations of the labels include "inner loop" or "outer loop", "inner beltline" or "outer beltline", "inner ring" or "outer ring", "inner rail" or "outer rail", and "inner circle" or "outer circle".
  In 2009, Interstate 277 in Charlotte, North Carolina, became the first non-contiguous loop route to utilize inner–outer directional signage.
context_section_description: Inner and outer directions may be used as the primary labeling system for routes or as a system secondary to another system such as compass directions.
caption: The Boulevard Périphérique around Paris, France is signed with inner and outer (French: intérieur and extérieur) labelling.  Roads in France are not given compass directions.
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