A few years back heading to long beach a truck in front of me on the 710 loaded with crushed cars lost a hood off of one of them. I had to duck as it flew right over my head. At the time I was in my MG with no top and if I was car that was any higher it would of come through the windshield.

When I lived in az I was replacing windshields on average every 15k miles. I always waited till the 3rd or 4th major rock hit to change them out. AZ roads just plain suck.