The windscreen thing is a red herring. Yes, there were more bug splats in the 80s than now, but that's partly due to the way we were driving bricks then (i.e. Escorts and Novas), versus today's streamlined cars. The drag coefficient of a modern Astra, for example, is lower than that of a McLaren Speedtail - albeit it doesn't go anywhere near as fast!
As a result of cars become more aerodynamic, you'd expect fewer splats.
The number plate test would be better (as those are still much as they were), but I don't know how far back data goes for that one!
Originally Posted by: Retron