This study addresses the evolution of footbridges, highlighting the increasing use of materials such as glass fiber reinforced polymer (GFRP) in constructing these structures. With the development of these lighter and resistant materials, longer and more slender footbridges have been built to reach large spans. However, these structures are sensitive to dynamic loads, such as human walking, posing a challenge due to possible resonances that can affect user comfort and structural integrity. The study aims to evaluate the accelerations generated by human walking on a GFRP cable-stayed footbridge, using as a case study the Kolding footbridge in Denmark, the world’s first footbridge over a railway entirely constructed in composite materials.