Due to an increasing interest in recreational running, groups of jogging people becomes a more frequentload case on footbridges. The studies related to runners on footbridges are very limited and according tocurrent design guidelines, running loads need not being considered. This study aims at investigating if theeffect of running pedestrians on a footbridge is negligible. In order to do so, a case study comprising fieldtests and numerical simulations using three modelling approaches is performed. For a group of walkingpeople, the footbridge experiences accelerations well below the limit given by the design guidelines, while fora single person running, the acceleration limit is exceeded. Therefore, the main conclusion is that, in certaincases, it is highly motivated to include runners as a required load case in the design phase of a pedestrianbridge, even though walking might not cause any problems. Further, it is concluded that, for this particularbridge, two of the numerical models give desirable correspondence between simulations and measurements.