Freeway

A freeway is a multi-lane highway designed for high-speed travel by large numbers of vehicles, and having no traffic lights, stop signs, nor other regulations requiring vehicles to stop for cross-traffic.
In general Design features
Freeways have high speed limits and multiple lanes for travel in each direction. The number of lanes may vary from four or six in rural areas to as high as sixteen or eighteen in certain global cities.
A median or central reservation separates the lanes traveling in opposite directions. Partition may be achieved through distance or through the use of high crash barriers like cable barriers and Jersey barriers.
Crossroads are bypassed by grade division using underpasses and overpasses. In addition to the sidewalks attached to roads that go over or under a freeway, nearly all countries also supply specialized pedestrian bridges and underground tunnels. Such structures enable pedestrians and cyclists to cross the freeway without having to make a long detour to the nearest road for which a grade separation has been provided.
Freeway entrances and exits are limited in number, and are designed with special onramps and off ramps, so as to ensure that vehicles do not disrupt the main flow of traffic as they enter or leave the freeway. In some countries, the exits are numbered. Exit numbering may be by mile or kilometer, or in a simple chronological fashion.