Mass. Gen. Laws ch. 231, § 140A: Conclusiveness of consent judgment in automobile case

Section 140A. In an action to recover damages for injuries to person or property, or for death, or consequential damages, so called, sustained by reason of a motor vehicle accident, a judgment entered by agreement of the parties, without a hearing on the merits, shall not operate as a bar to an action brought by a defendant in the action in which such judgment was entered, unless such agreement was signed by the defendant in person.