The dynamic behavior of a footbridge over the Sarine River located in Broc, Switzerland, was the subject of an investigation conducted in the context of the first author's MSc thesis at the Institute of Construction and Environmental Technology at the University of Applied Sciences of Western Switzerland, Fribourg. The bridge is a single 52 m-span steel space truss. The final goal of this investigation was to propose reasonable remedial measures in case of excessive vibrations arising under pedestrian traffic conditions. To reach this final goal, an analytical as well as an experimental modal analysis were first performed. The Scia software package was used for the analytical analysis. Three modes with a significant physical meaning could be identified. The experimental part consisted of a modal analysis under "optimized" ambient conditions. Why and how "optimization" was performed is discussed in the paper. The experimental part yielded 29 bridge mode frequencies, mode shapes and damping. Considering the experimental results, 34 traffic tests were subsequently conducted on the bridge. These tests also included some uncontrolled pedestrian crossings. However, one, two or five in-line pedestrians crossed the bridge with a controlled step pace and axis of motion in the majority of the tests. Additionally, some vandalism tests were performed. These tests showed that a) no excessive bridge vibrations are to be expected under normal daily traffic conditions, b) conditions can artificially be tuned to excite bridge vibrations of about 3.4 m/s2 intensity, and c) vandalism is no great danger for the bridge. Remedial measures are not necessary at the moment.