It's two things, one personal vehicles are designed to bend air around them rather than slice through or just brute force through air resistance. This means that more bugs are pushed out of the way with newer vehicles now, compared to older vehicles which just had the bug hit the windshield. The second and much more impactful reason is because the insect population has dropped significantly in the last 25 years.
Others have given reasons, I'd like to add a number : insect population has dropped by 80%. They're near the base of the food chain, so it's very concerning. I'm not linking a study because I'm lazy, however it's very easy to find
Unfortunately yes. This story by NPR isn't an academic source but it's definitely worth listening to. On average bug populations have declined by 2% a year for decades or more in some areas, less in others. It's an average.
Now truthfully, whether or not a declining bug population is the main cause of fewer bugs on our windshields or if it's better aerodynamics I don't know. What I do know is a more aerodynamic vehicle isn't something I need to worry about, a declining bug population is.
Huh, I think they all flew to Mexico, I did a road trip from Mexico to Austin TX recently and I do recall having not many bugs in my windshield in the USA... But back home to Mexico they all started to appear LMAO.
Car design change? I'd assume that more aerodynamic cars airflow that sweeps more bugs away rather than smacking them into the glass. I can assure you that they still hit motorcycle visors.
I just drove through Tennessee, Arkansas, and Texas and confirmed there are still enough bugs out there to make you use a squeegee when you fill up for gas. But I remember when I was younger having to stop just to clean the windshield or else you wouldn't be able to see.