I agree with Evo. Defensive driving does work and that doesn't mean constantly defending your right to your piece of the road. Everyone is going to make a mistake, eventually, and it's nice if at least a few of those mistakes (yours and the other drivers) don't automatically result in a wreck.
Not quite as impressive a record as Evo's, but I've never been in an accident where either car was going even 5 mph by time of the collision. You'd think that would ensure minor damage but not necessarily. My first accident, our bumpers locked - I let off the brake and his entire front end decided it liked my car better than his.
Only exception was one cold night where my car broke down on a seldom traveled country road. I had my emergency flashers on, plus I had safety flares in the trunk. I set one about a 100' up the road and it burned out in about half an hour with no success in getting my car restarted and still not a single car coming along. I was behind the car trying to get the second flare lit (with half frozen hands) when help finally appeared in a pair of headlights. Except he didn't slow down. I finally had to dive off the road and popped up just in time to see him reduce the trunk of my Delta 88 to about 18" long. No screeching brkaes - nothing. He just drove right through the trunk of my car. After totally trashing my car, he had the nerve to try to restart his car and leave. At first that upset me a lot, until I ran up to the scene and saw his engine was laying on the ground. Then there were 4 of us (he had two passengers) stuck out on a country road on a cold winter night - but at least I didn't have to struggle with trying to get my car started.
When another car finally did drive by and sent help, the police had both me and the other driver, a 16-year-old, in the back seat and was asking questions. Such as (to the 16-year-old) "Did you have anything to drink?" "Yeah, we had a beer at the xxxxx club." A few more questions, including how they got in the club when they were only 16 and a second question about how much they had to drink "Oh, we had about 2 beers." More questions, a return to the drinking question "Oh, I think I drank about 3 or 4 beers."
Then, finally, THE question, "Didn't you see his emergency flashers?" - "Yeah, but I just thought he was going over hills." The officer didn't ask him how much he had to drink, anymore.