Highways in Greece

Highways in Greece are generally organized so that the odd numbered highways are of north-south alignment and even numbered highways are of east-west alignment. However, there are many exceptions.

The designation of some important roads of Greece as "national" was decided by a 1955 decree, while a minister's decision in 1963 determined the numbering of these roads. In 1998, a survey of the Hellenic Statistical Authority defined some new national roads that were constructed after the 1963 decision. Furthermore, motorway numbers in Greece are different and irrelevant to other highways' numbers. For example, Motorway 6 (A6) refers to the Attiki Odos motorway, while "GR-6" refers to National Road 6.

With a total length of about 2.500 km as of 2017, Greece's motorway network is the biggest one in Southeastern Europe and one of the most advanced in Europe.

Greece's motorway network has been extensively modernised throughout the 2000s and part of it is still under construction. Most of it was completed by early 2017. There are a total of 10 main routes throughout the Greek mainland and Crete, from which some feature numerous branches/auxiliary routes, as described in the listing below.

section Chalastra - Evzonoi is an expressway

section Ioannina - Kakavia is under planning.

no emergency lane, green signs

section Kato Christos - Sidirokastro upgrade under planning

section Ptolemaida - Florina under planning to be upgraded

sections Pikermi - Rafina and southern expansion under planning

pre-existing section is not a motorway

Motorway 1 () is the oldest and most important motorway of Greece, connecting the country's largest cities, Athens and Thessaloniki and passing through many important regions of Greece on a south-north direction. Section Chalastra - Evzonoi was constructed earlier as an expressway, with no upgrade planned.

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