Comments: - - Historically, many roads were simply recognizable routes that did not require any formal construction or maintenance. 

The Organization for Economic Co-operation and Development (OECD) defines a road as "a line of communication (travel route) using public traffic lanes, primarily for use by motor vehicles running on rails or a stabilized base other than air," Bridges, tunnels, supporting structures, intersections own wheels", including "roundabouts, junctions and toll roads", but not including bicycle paths. 

The Eurostat, ITC and UNECE Illustrated Dictionary of Transport Statistics defines a road as a "Series of communications (travel road) open to public traffic, primarily for motor land vehicle use, using a stabilized base outside of rails or lanes. [...] Asphalt. includes roads and other roads with stabilized foundations, for example gravel roads. Roads also include streets, bridges, tunnels, supporting structures, intersections, intersections and intersections. Also includes toll roads. Special bike lanes are excluded. " 

The 1968 Vienna Convention on Road Traffic defines a road as any road or the entire surface of a street open to public traffic. 

In urban areas, roads can be separated from a city or village and referred to as streets that serve a dual function as urban area easement and route.  Modern roads are normally leveled, paved or prepared to allow easy travel.