[2] It connects Sarakhs at the border with Turkmenistan to Mashhad, then to Gorgan, and afterwards it runs parallel to the Caspian Sea.

Most parts of this road are expressways but some of them are in the Golestan Jungle.

[3] A bypass in Langrud, Gilan with a length of 11 km is under construction.

[5] A bypass in Mahmudabad, Mazandaran with a length of 12.6 km is under construction.

There is an ongoing construction project to twin the section in between Gorgan-Bojnurd with a total length of 300 km.