Bridges are seen as symbols for the crossroads of life, so therefore, it can also be the setting for an important plot point. Bridges are often used as meeting places, places for swaps, etc., anything relative to the plot. This is sometimes done when they form the border between two territories. They can also serve as the only connection for the isolated region to the mainland. It can also be a battlefield for two men in a duel, with the loser falling to their doom. In this scenario, underneath the bridge is a chasm, some rapids, a pit of spikes, or anything deadly.