Forgive me if this has come up before, but how serious is a cracked windsheild from a safety standpoint? I have large (1.5 ft) crack across my windsheild. It is worth fixing? It does not obscure my vision, but I hear that it makes the windsheild dangerous in a crash. Is this true or is this glass repair company propaganda? The crack is too big for a patch job and I don't want to replace the whole windsheild if this is only a cosmetic problem. I have a 2002 Honda Civic, although I imagine this question applies to any car windsheild.