As the population increase, urbanization of the country and transportation systems is in leading demand serving as backbone of the country. The escalating demand of roads and infrastructures is prime motto to increase the present road networks with most efficient usage of natural resources and budgets. In this perspective, providing an ecofriendly and economical solution without affecting the integrity of the flexible pavement using geogrid reinforcement is the need of the hour. In this paper, a case study is presented with construction of geogrid-reinforced flexible pavement. The case study is about construction of four lane highway from Ballia to Rawalganj bypass in the state of Uttar Pradesh section of National Highway (NH) 31. The pavement was designed for 15% of effective California Bearing Ratio (CBR) and 50 MSA (Million Standard Axles) traffic volume with geogrid’s Modulus Improvement Factor (MIF) value of 1.95. To check the efficacy of geogrid, a dynamic plate load test was conducted in the laboratory at 10% of effective CBR and Layer Coefficient Ratio (LCR) was calculated and further MIF value of the geogrid was calculated. To validate the design MIF factor in the field, a static plate load test was conducted in the field at the effective CBR of 15%, and MIF and LCR values of geogrid were evaluated. The MIF value of geogrid obtained from the on-site evaluation exceeded the design requirements and hence the further construction of pavement was carried out.