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A '''road hierarchy''' is a system for categorizing [[road]]s. Road networks worldwide are typically organized according to one or more schemes:
* ''Functional classification'' reflects a road’s intended role, balancing mobility (efficient through movement) and access (reaching properties) by defining a clear hierarchy from [[Arterial road|arterial]]s (including [[Controlled-access highway|expressway]]s) to [[Collector road|collector]]s and local roads.<ref name="fhwa-functional-classification"/><ref name="erso-classification"/>
* ''Administrative classification'' mirrors government tiers responsible for funding and maintenance, creating a hierarchy from national to local roads.
* ''Design type classification'' groups roads by [[Geometric design of roads|geometric]] and operational characteristics, such as lane configuration and access control, and does not always form a strict hierarchy.<ref name="aashto-functional-classification"/><ref name="erso-classification"/>
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