no, some people here just flunked out of high school comp. it is inappropriate to refer to an accident as a tragedy.
Tragedy is "an imitation of an action that is serious, complete and of a certain magnitude; in language embellished with each kind of artistic ornament... in the form of drama, not of narrative, through pity and fear effecting the proper purgation of these emotions (catharsis)." Tragedy must tell of a person who is "highly renowned and prosperous" and who falls as a result of some "error, or frailty," because of external or internal forces, or both.
http://theliterarylink.com/tragedy.html