Could the windshield thing have something to do with more cars on the roads? Instead of 1 car hitting 100 insects, 100 cars are each hitting 1 insect? When I was a kid there were a lot fewer cars on the highways. I grew up in the Western US and I remember that on road trips my dad (who was in the military) would often pull off on the side of the free way, set up some targets, and do some target shooting with us kids. It wasn't a big deal back then with few people on the roads, but if someone was to pull out some rifles right off the side of the freeway nowadays...!