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On the controlled-access highway, opposing directions of travel are generally separated by a median strip or central reservation containing a traffic barrier or grass. Elimination of conflicts with other directions of traffic dramatically improves safety, [2] while increasing traffic capacity and speed.
A controlled-access highway is a type of road that has limited access and high speed. This web page lists the names and features of such highways in different countries and regions of the world.
An arterial road is a road without controlled access that can carry a large volume of local traffic at a generally high speed, being below controlled-access highways in the hierarchy. Learn more about the road hierarchy, its functions, capacities, and examples from different countries.
Learn about the history, technology and benefits of electronic toll collection (ETC), a wireless system to automatically charge vehicles using toll roads and bridges. Find out how ETC works in different countries and regions, such as Singapore, Italy, Norway and Japan.
An interchange is a road junction that uses grade separations to allow traffic between two or more highways. Learn about different types of interchanges, such as cloverleaf, diamond, stack, and weave, and the terms for ramps and slip roads.
A stack interchange is a type of grade-separated junction between two controlled-access highways that allows for free-flowing movement in all directions. Learn about the definition, history, and examples of stack interchanges in the United States and other countries.
A partial cloverleaf interchange or parclo is a modification of a cloverleaf interchange with fewer ramps and less grade separation. Learn about the different configurations, naming conventions, and examples of parclos in North America and Europe.
Contraflow lane reversal is the altering of the normal flow of traffic on a highway to aid in an emergency evacuation or facilitate road construction. Learn about the different types, examples, and methods of contraflow lane reversal in various countries and regions.