The world’s roadway systems are so extensive that if combined, their total length would encircle the Earth over 1,600 times. Geosynthetics have provided sustainable alternatives in roadway pro-jects, which currently represent a significant portion of the total geosynthetics market. Yet, geosynthetics are still employed in a small fraction of roadway projects worldwide. Accordingly, the opportunities to achieve sustainability benchmarks by increasing the presence of geosynthetics in roadways are, simply, enormous. This paper focuses on six types of applications that can be identified where geosynthetics can be used to improve roadway performance. Each application uses one or more of the various geosynthetic functions, including separation, filtration, reinforcement, stiffening, drainage, barrier, and protection. The applications include the mitigation of reflective cracking in asphalt overlays, separation, stabilization of road bases, stabilization of road soft subgrades, mitigation of environmental loads, and and lateral drainage. This paper illustrates the mechanisms as well as key advances in each one of these multiple applications. In addition, the paper illustrates relevant case histories for each application, which illustrates the relevance their relevance in roadway engineering. The impact of selection of geosynthetics in sustainability for each case history can be quantified by conducting a quantification of the carbon footprint. In addition to address key technical aspects, the solutions provided by geosynthetics also provided significant sustainability ben-efits
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