A discrepancy in Illinois law on the meaning of “common liability” in Section 2(b) of the Joint Tortfeasor Contribution Act presented U.S. District Judge J. Phil Gilbert with a difficult question in Safety International’s contribution case against three defendants (Alexandria Transportation, Alexandre Solomakha and Alex Express) about whether Edwards-Kamadulski — a general contractor that settled with the plaintiffs (Thomas and Diane Roberts) after Alex’s freightliner crashed into their car in …