Modern roads are normally smoothed, paved, or otherwise prepared to allow easy travel. In urban areas roads may diverge through a city or village and be named as streets, serving a dual function as urban space easement and route. The 1968 Vienna Convention on Road Traffic defines a road as the entire surface of any way or street open to public traffic. Roads also cover streets, bridges, tunnels, supporting structures, junctions, crossings and interchanges. Included are paved roads and other roads with a stabilized base, e.g. The Eurostat, ITF and UNECE Glossary for Transport Statistics Illustrated defines a road as a "Line of communication (traveled way) open to public traffic, primarily for the use of road motor vehicles, using a stabilized base other than rails or air strips. The Organization for Economic Co-operation and Development (OECD) defines a road as "a line of communication (travelled way) using a stabilized base other than rails or air strips open to public traffic, primarily for the use of road motor vehicles running on their own wheels", which includes "bridges, tunnels, supporting structures, junctions, crossings, interchanges, and toll roads, but not cycle paths". Historically many roads were simply recognizable routes without any formal construction or maintenance. Demarcated land route for travel with a suitable surface Public infrastructure
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