Is that not in part to do with higher temperatures. France is significantly warmer than here most of the year and always had a lot more insect life.Rural France is alive with insects and wildlife . Its great to see, and highlighted to me just how much we've lost in Ireland.
I’m not saying we don’t have a crisis due to use of insecticides but in general if you’ve cooler climates insects cannot self heat like birds and mammals so you simply don’t get as much activity.
Also I’m wondering on the comparison between 1970s cars and 2017 cars could almost of the lack of insect road kill be to with aerodynamics? Modern cars are designed not to catch air on surfaces to reduce drag. The result of that is you would aim to have a flow of air around the car, not impacting it forceful. That would cause insects to get caught in a current that sweeps them off the window and safely around the car, unsquished.
Again I’m not saying that there isn’t a problem and I do ageee with banning the harmful pesticides that are risking pollinators but I think we need to be making arguments with irrefutable survey data to back this up.
I’m noticing far fewer bees than I would have seen around in the past and even this year wasps seemed to be less of a thing whereas I’m normally plagued with them. However mosquitos seem to be doing fine ... I’ve never been bitten by mosquitos much in Ireland but this summer in cork we had a major problem with them at my house to the extent we had to start using citronella.