I wish I could tell what parts of such games were realistic, and then be able to practice emergency maneuvers - e.g. at 70 mph, cargo falls off the back of a pickup I'm following - just how sharply can I swerve my Toyota Corolla without going into a roll?
Gran Turismo has cartoon physics (or at least the first 4 or 5 did) not the best one to translate from.
That said, you probably won't roll a Corolla (low center of mass and relatively low grip tires) without hitting something like a curb or a surface change. You are more likely to just uncontrollably drive in to an obstacle.