It is late in the evening rush hour, typical stop-and-go traffic. Finally, there is a break; the tightly packed group around you is soon cruising together at 55 mph. Suddenly, you see brake lights flare up ahead. As you prepare to brake, you glance in the rearview mirror and see an alarming sight--a car closing way too fast on your rear fender. The teenage driver looks panicked, one hand clutching the steering wheel, the other hand clenching a cell phone. You brace for the terrible impact...