Abstarct: For decades, concrete has been a vital construction material in the development of various structures, including buildings, bridges, dams, and pavements. Conventional concrete is a brittle material with low tensile strength and strain capacity. To address these limitations, the use of fibers to reinforce concrete has gained significant attention over the past few decades. The primary objective of adding fibers is not merely to enhance strength but also to control cracking and improve the ductility of the concrete after cracking occurs. Given the expansion of transportation systems and the growing demand for concrete pavements, this research focuses on studying the application of macro-synthetic Twist fibers and micro-synthetic polypropylene (PP) fibers in traffic-bearing concrete pavements. To achieve this, 21 concrete mix designs were developed, and the samples were tested for compressive strength, tensile strength, flexural strength, impact resistance, and shrinkage performance. The results showed that fibers have a negligible impact on compressive strength and, in some cases, may even reduce it; however, they significantly increase the tensile and flexural strength of the concrete. Furthermore, the impact resistance of the fiber-reinforced concrete samples improved by up to 5 times compared to conventional concrete. Analysis of the results revealed that the mix design containing 0.11% Twist fibers and 0.165% polypropylene fibers provided the best performance. Finally, a computer software tool was developed to calculate the optimal thickness of concrete pavements baxsed on the intended application and to recommend the ideal fiber composition.