The construction pavements have high strength, better durability and have the moderate economy for a long period of time. The pressure nowadays is to make light and green pavements of better serviceability, which can resist loads of high intensity. The main objective of this study is to design the slab thickness of pavement quality concrete (PQC) using achieved the flexural strength of the concrete mixture. In this study, glass fiber is added to concrete at different percentages like 0.05%, 0.1%, 0.2%, and 0.4% and then these results are compared to the normal concrete mix. The flexural and split tensile strength are increasing as the fiber content is increasing. The study shows that having the high values of flexural strength and split tensile strength helps in higher load carrying capacity and higher life expectancy. The addition of glass fiber to concrete help in reducing the slab thickness and the least thickness of pavement slab is found for the addition of 0.4% glass fiber to concrete. As for pavement slab thickness is also reduced for M4-GF (0.05%) mix by 110 mm as compared with control mix result as per IRC 58:2002. The study helps in decreasing the cost of the project, thus by saving the cost of the material without even decreasing the strength of concrete.