At-grade intersection in the context of "Greek National Road 2"

In civil engineering (and more specifically, highway or railway engineering), grade separation is a method of aligning a junction of two or more surface transport axes at different heights (grades) so that they will not disrupt the traffic flow on other transit routes when they cross each other. The composition of such transport axes does not have to be uniform; it can consist of a mixture of roads, footpaths, railways, canals, or airport runways. Bridges (or overpasses, also called flyovers), tunnels (or underpasses), or a combination of both can be built at a junction to achieve the needed grade separation.

In North America, a grade-separated junction may be referred to as a grade separation or as an interchange – in contrast with an intersection, at-grade, a diamond crossing or a level crossing, which are not grade-separated.

Greek National Road 7 (Greek: Εθνική Οδός 7, abbreviated as EO7) is a single carriageway with at-grade intersections in the Peloponnese region in southern Greece. It connects the cities of Corinth and Kalamata, via Nemea, Argos, Tripoli and Megalopoli. It has been succeeded in importance by the A7 motorway (Corinth–Tripoli–Kalamata).

The A1 motorway, locally referred to as the Nicosia–Limassol highway, is the first and longest motorway built in Cyprus. It marked the beginning of an ambitious government project to link all the main cities on the island with modern four-lane highways. The A1 is 73 kilometres (45 miles) long, and is free of any at-grade intersections. It links the capital Nicosia (which is the administrative and financial hub), with Limassol, the second largest city and largest port on the island.

A level junction (or in the United Kingdom a flat crossing) is a railway junction that has a track configuration in which merging or crossing railroad lines provide track connections with each other that require trains to cross over in front of opposing traffic at grade (i.e. on the level).

The cross-over structure is sometimes called a diamond junction or diamond crossing in reference to the diamond-shaped center. The two tracks need not necessarily be of the same gauge.A diamond crossing is also used as a component of a double junction, like the one illustrated on the right.