With the help of geosynthetics innovative, economic and durable solutions can be offered to several situations where standard soil improvement techniques are still extensively used. This paper is interested by the design and the construction of the road with reinforced embankment crossing the sabkha flat of Chott El Hodna on 11 km length in the north middle of Algeria. Sabkha soils are associated with many geotechnical problems, due to the presence of salt crystals of different sizes, shapes and compositions; and the highly saline and shallow ground water table. Due to the poor bearing capacity of the present sabkha surface and the arising water table over the soil surface serious difficulties were faced during the investigation of the subsurface soil and the construction of the road embankment. After the project description and soil investigation, the need of reinforced embankment by geosynthetic was well highlighted by numerical modelling and confirmed by the difficulty reencountered in the placement of the two first embankment lift and the compaction performance. The in situ observation indicated also that the use of geotextile separation has a beneficial effect on sabkha soils, especially under wet conditions and shallow ground water table.