[mikestew]

The aerodynamics of our ‘81 VW camper van haven’t changed in 43 years (basically a barn door). We get significantly less bug splatter on the windshield than, say, 20 years ago.

And though I can’t find the link again, it has been claimed that a more aerodynamic vehicle should get more bug splatter. I don’t remember why, attack angle maybe?

[maxerickson]

Another factor is that the right of way for highways is generally cleared further back (I guess for things like deer strikes). Insects have to go a long way out into a heat island to get to the center of the right of way these days.