You can`t come back later and assert legal rights that you should have asserted earlier. In a typical car accident settlement agreement, the injured victim agrees to exempt the party legally liable for payment of money (sometimes combined with other forms of compensation) from future financial liability. A transaction terminates a legal right. If the victim has already filed an appeal against the responsible party, the transaction almost always involves an agreement to terminate the complaint. If the injured person has not yet filed a complaint, the agreement generally prohibits the filing of legal action in the future. Their request could be resolved fairly quickly, or it could be a long and lengthy process that will require significant judicial involvement.