The plot of the male protagonist and his girlfriend driving through a suspension bridge was probably one of the common plots in many horror movies or novels. In this scenario, there is usually a suspension bridge or other structure that is thought to imply the existence of ghosts or monsters. When the protagonists enter the structure, it usually causes some mysterious event or threat. This kind of plot is usually used to create an exciting atmosphere to attract the audience's attention and increase the horror element of the movie or novel. If you like this kind of plot, you can try to create your own or watch similar movies or novels to get more inspiration and creativity.