There are many meanings that you could give to this symbol. The details in the dream are just as important as the bridge itself. The first consideration should be given to how much you travel. The bridge can be interpreted literally if it is a part of your daily commute. On a more theoretical level, bridges can symbolize transitions (e.g. transition from one stage to another, from one level of consciousness to another). Since most bridges are over water (i.e. emotions, unconscious), this dream could also be symbolic of your rising above your emotional difficulties or unconscious drives.