National Road No.1 starts from the Mediterranean Sea in the north and ends in the middle of Africa crossing through Sahara Desert. It is important to the economy and the security of the country.

The total length of Chiffa Section is 53 km, including 3 km tunnel and 17 km bridge.
It is the starting point of the National Road, running through Atlas Mountains.
The geographical conditions are quite complicated with cliffs and river valleys