More likely it's the 10,000 cars, trucks and busses that are just in front
of you on the highway that "cleaned out" all the bugs before you got there.

.... or is it because there are fewer bugs these days? I remember car
windshields getting so covered with bug splats that you had to clean
them several times a day. That was 50 years ago. Doesn't seem to
happen today.

For that matter, I remember seeing huge flocks of birds as well. Don't
see many these days.

David Johnson