A few years ago I went on a Battlefield Tour of Normandy with the British Legion, where I had the honour of walking up a beach with a gentleman who had last set foot there in 1944 with a mine detector in hand. After a few days around there we headed back.  At first our route was through small fields and orchards. The area is noted for its variety of tasty cheeses and for calvados, distilled from cider.  When we paused at a service station before entering the motorway, the bus driver took the opportunity to wash the windscreen, which was almost opaque with squashed insects.
The motorway took us through an area of industrial agriculture, mainly vast arable fields with few hedges and little livestock.  The driver cleaned the windscreen again when we got to Calais but there was little need as there were only a few insects.
Back in England he headed north towards Cambridge, where he dropped us off.  The windscreen was as clean as is had been after he last washed it.
Of course it is possible that the passage of time may have skewed the results: are there fewer insects around in the afternoon then in the morning?
Chris

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