It's not something we happy-go-lucky roadtrippers like to dwell upon, but about 50,000 people die each year in collisions on the roadways of the United States. By most estimates, over twenty-two million are injured. The costs associated with such collisions are staggering -- often quoted at more than $80 billion. This carnage is unnecessary since nearly all collisions are preventable. How? Glad you asked! RoadTrip America's contributing expert Robert Schaller has the answers. In this collection, "70 Rules of Defensive Driving," he shares wisdom gained from nearly fifteen years of teaching defensive driving and traffic law in his home state of Arizona.