The United States has the largest network of roads of any country with 4,050,717 miles (6,518,997 km) as of 2009. The People's Republic of China is second with 3,583,715 kilometres (2,226,817 mi) of r ...
Main article: Transport economicsA city street in Mumbai, India with left-hand traffic.Transport economics is used to understand both the relationship between the transport system and the wider econom ...
Right- and left-hand traffic__Main article: Right- and left-hand trafficTraffic flows on the right or on the left side of the road depending on the country. In countries where traffic flows on the rig ...
Alignment — the route of the road, defined as a series of horizontal tangents and curves.Adverse camber — where a road slopes towards the outside of a bend, increasing the likelihood that vehicles t ...
Main article: Environmental impacts of roadsAir pollution along Pasadena Highway in Los Angeles, CaliforniaCareful design and construction of a road can reduce any negative environmental impacts.Water ...
Careful design and construction of roads can increase road traffic safety and reduce the harm (deaths, injuries, and property damage) on the highway system from traffic collisions.On neighborhood road ...
Like all structures, roads deteriorate over time. Deterioration is primarily due to accumulated damage from vehicles, however environmental effects such as frost heaves, thermal cracking and oxidation ...
Road construction requires the creation of a continuous right-of-way, overcoming geographic obstacles and having grades low enough to permit vehicle or foot travel. (pg15) and may be required to meet ...
The subject of road design is considered part of highway engineering. Structural road design is the science of designing a road for its environment in order to extend its longevity and reduce maintena ...
Main article: History of road transportThe assertion that the first pathways were the trails made by animals has not been universally accepted, since in many cases animals do not follow constant paths ...
The Organisation 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 traff ...
A road is a thoroughfare, route, or way on land between two places, which has been paved or otherwise improved to allow travel by some conveyance, including a horse, cart, or motor vehicle. Roads cons ...
