A road is a route that has been paved or otherwise improved for travel by foot or vehicle. Possible road surfaces include dirt, gravel, concrete, and asphalt.
Paved roads in urban settings are generally referred to as streets. They may have adjoining sidewalks for pedestrian use. Narrow lanes too small for vehicular use are called alleys.
Public roads, especially multi-lane arterial roads and major roads between cities, may be called highways.
