Tehran-Shomal Freeway is the most difficult, expensive and heaviest road construction project in Iran and the long-standing desire of smooth, safe and short access from Tehran and other provinces to the coast of the Caspian Sea and its tourism features, which replaces the old Karaj-Chalus road. This freeway, which is built according to today’s standards, will provide basic factors of safety, comfort, time and fuel reduction for users in this mountainous and snow-covered road.

Parts AB2, B2, C2witha length of 7. 8 kilometers, morethan %95 of which with many bridges, tunnels and special galleries, passing through the most difficult geological areas and difficult and mountainous valleys of Alborz with a beautiful view of the river Chalus valleyis under construction.