The economic and social development of nations all over the world relay to a large extent on the quality of its road transportation system. Vast amounts of money have been invested and are still being invested in the construction of roads. Similarly, large amount of money is required to ensure that these roads having been constructed can continuously fulfill their function. Nigerian roads presently are largely dominated by flexible pavements, even with the glaring evidence that these roads have been consistently performing poorly, this however has call for a lot of both periodic and routine maintenance funds, establishment of Road maintenance agencies at states and Federal levels making the overall pavement costs substantially high and thus posing the possible challenge of not giving returns on investment by the end of the design period. Therefore, the study is focused on reviewing the existing pavements and their performance on the roads under the different soil CBR and eventually forming an opinion on the best suited pavement. Both flexible and rigid/concrete are the two commonly used pavements globally. The unit cost for each of the pavement were computed for a comparative cost analysis. The results for the thicknesses of the flexible pavement at CBR value of 12% against the following Equivalent single axial loads (ESAL) of 0.3, 0.5, 1.10, 2.25, 4.5 and 8.0 are 425,460,400,403,530 and 470 respectively. The results of the flexible pavement design thicknesses presented above shows a general increase of thickness from left to right and decreases from top to bottom an indication that the thickness of flexible pavement is greatly influence by the traffic load and soil strength. While that of rigid pavement thicknesses are 297, 315, 341, 348, 366 and 391 at Equivalent single axial loads (ESAL) of 0.3, 0.5, 1.10, 2.25, 4.5and 8.0. The cost implication for the flexible pavement at 12% CBR are 66.384, 80.996, 116.998, 129.819, and 141.989 (MN) and that for the rigid pavement are 79.458, 85.724, 94.775, 97.211, 103.477, 112.179 (MN) all at the same pavement thicknesses.
