Same roads doesn't even control. If you lived in a town that e.g. changed the very local environment (say drained one specific swamp), the nearby roads my have less bugs for a very uninteresting reason

That is the interesting reason.

While the retraction brings into question the anecdotal evidence for the windscreen phenomenon ( https://en.wikipedia.org/wiki/Windshield_phenomenon ), there are other studies with other sampling approaches that support the global insect population collapse ( https://en.wikipedia.org/wiki/Decline_in_insect_populations ).