I like guns and have owned them all my life. Have not shot one in many years and hope to never shoot one in defense. I think the best tool on the road is bear spray. Good for 30 feet, not lethal so the bar for use is not so high and its legal anywhere, almost. It will stop the situation. If the other guy is shooting at you you're probably already dead anyway. My 100+ pound dog, bear spray, cell phone, are always with me along with some self awareness and common sense. For the breakdown in the middle of no where on a dark night, I go to plan "B".