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Added diagram explaining why road hierarchies exist |
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{{More citations needed|date=March 2022}}
{{Use dmy dates|date=October 2021}}
{{Annotated image |image=Road-hierarchy-channelization.svg |image-width=250 |width=170 |height=195 |caption=Travel demand (represented by desire line thickness) is channeled through a road hierarchy to reduce costs. High-demand trips are served by direct higher-class roads, while less frequent trips
{{Annotated image |image=Basic functional road classes.svg |image-width=280 |width=225 |height=203 |caption=Basic functional road classes (arterial, collector and local) along the mobility-access continuum. Naming, range and subdivisions of each class vary by [[administrative division]].}}
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