Iran route numbering system is a network of highways and roads in Iran that is managed by Iran Road Maintenance & Transportation Organization. The network comprises main highways and several major and minor country roads.
Route signs blue on motorways, green on other roads. 3-digit numbers appear in black on a white rectangle
Routes
Asian Highways
Motorway (Freeway)
Numbers roughly increase from west to east .
, (Hamedan-Kermanshah-Khosravi) planned
Partly built Partly Built
Bypasses A most of the bypass freeways are part of the one-digit motorways (Such as Tehran Southern bypass is part of the freeway 2, Isfahan bypasses are part of the freeway 7, and Arak northern bypass is a part of freeway 5.) but there are a few bypasses that they are not part of the one-digit freeways. and they are only known freeways with the same number.
Partly built Partly built
National highway
Odd numbers (11-99) generally denote north-south routes, while even numbers (12-98) denote east-west routes. Numbers increase in eastbound and southbound direction respectively. There are some A roads without a national number. Motorways do not have national numbers. 3-digit numbers are derived from 2-digit numbers by adding a digit at the end.
(Sari-Tehran) Some parts of it under construction
Turkmenistan-Mashhad-Mazandaran Bardaskan-Taybad Tehran-Mashhad
References Iran Road Maintenance & Transportation Organization Road management center of Iran Ministry of Roads & Urban Development of Iran