The Municipality of Rotterdam's engineering office is increasingly turning to the use of intelligent products; not just fibre-reinforced polymers, but fresh techniques such as Ultra High Strength Concrete (UHSC). It is now conceivable with the use of these innovative materials to reach higher slenderness ratios. Using these innovative materials, it is now conceivable to achieve greater slender ratios. The resulting weight decrease of a new bridge means that it is more susceptible to vibrations, which can cause pedestrians significant discomfort when using it. The pedestrians’ understanding of such vibrations is complex and not readily measured, but the ranges of accelerations and displacements corresponding to different levels of suitability were investigated.