4. Further work on the interpretation of the in situ penetration tests

 is required to improve the correlations obtained in this study.' The

 use of the penetration tests to characterize the subgrade layer and

 the feasibility of the DMT to predict the moduli of weak subgrade

 soils should be investigated.

5. Additional stress analyses using load and thermal-induced stresses

 should be performed to establish relationships between pavement

 performance (stress-strain response) and material properties.

6. The algorithms obtained in this study should be used to develop a

 computer program for mechanistic evaluation of flexible pavements.

 This program should be able to predict the remaining life and/or

 overlay thickness of a pavement subjected to the combined effects of

 load and thermal-induced stresses.