Tehran-North Freeway is the most difficult, costly and the heaviest road construction project in Iran and the long-standing desire on having a smooth, safe and short access from Tehran and other provinces to the Caspian sea coast and its tourism features, which will replace the old Karaj- Chalus road. This freeway, which is being built according to current standards, will provide basic factors of safety, comfort, time and fuel savings for users in this mountainous and snowy axis.

Sections C2-B2-AB2-BR2 are 8.15 Km long, more than 95% of which is equipped with many bridges, tunnels and special galleries, passing through the most difficult geological zones and mountainous valleys of Alborz with a beautiful view of Chalus Valley. The western lane of the freeway was completed and put into operation in 2023 June, and its eastern lane is under construction.

Furthermore, studies of the first and second stages in 41 Km out of 49 Km of district#3 are also ongoing by this Consulting Engineers.