This article focuses on the evaluation and determination of the geotechnical characteristics of lateritic soils in South-West Chad (Kélo-Pala) with a view to better use in road construction. The study shows that borrowing volumes range from 29374.4 m3 to 87920 m3. The lateral soils studied consist of a mixture of fine particles and gravel with low plasticity. On the physical side, loans have a sieve percentage of 0.08 mm, ranging from 13.7% to 24.8% with an overall average of 18.9%. These values give the soils studied a grainy character. The liquidity limit of the soils studied ranges from 17.2% to 27.4% with an average of 21.17% and the plasticity index ranges from 3.6% to 9.3% with an average of 7%. These results show that the materials studied are noninflating with a small percentage of fine particles. They belong to class A-2-4 according to the HRB classification and class S5 (CBR> 30) according to the LCPC classification. On the mechanical side, the borrowings studied show that the optimal content ranges from 7.3% to 10.1% with an average of 8.55% and the optimal dry density ranges from 2.07g/cm3 to 2.2 g/cm3 with an average of 2.12 g/cm3. The CBR index ranges from 61% to 98% with an average of 79.90%. These results show that the engravers studied belong to class Gl1 and are usable and usable in road construction according to the recommendations of the CEBTP.