For instance, the summary may list a driver's average following distance, how often the collision avoidance system activates, how many lane departures have they had, hard braking events, etc.
Perhaps limiting it to stop and go, traffic jam driving conditions and gradually allowing higher speed driving as they gathered more data on their collision avoidance system.
The 550 souls on board would never know how close we'd come to oblivion, only to be saved by my cool head -- or, more accurately, the in-built collision avoidance system.