Iran route numbering system

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

Common route signs used in Iran
Freeway marker
Expressway marker
Road marker

Routes

Asian Highways

Motorway (Freeway)

Numbers roughly increase from west to east .

Freeway 1 (Qazvin-Rasht Freeway)
Freeway 2
Freeway 3 (Tehran-Shomal Freeway)
Freeway 5
Freeway 6 (Saveh-Hamedan Freeway), (Hamedan-Kermanshah-Khosravi) planned
Freeway 7
Freeway 9 (Mo'allem Freeway) (Isfahan-Shahinshahr Freeway)
Freeway 16 (Tabriz-Urmia Freeway) Partly built
Freeway 24 (Maragheh-Hashtrud Freeway) Partly Built
Freeway 51 (Zobahan Freeway)

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.

Freeway 21 (Tehran Eastern Bypass) Partly built
Freeway 56 (Qom Western Bypass) Partly built
Freeway 96 (Bandar Mahshahr Northern Bypass)

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.