I suspect it's mostly to do with perception: humans tend to see patterns, even when there isn't one there - we try to make sense out of random events.
Having said that, if I perceive any pattern, it's that pre-Christmas has the worst driving, and the Summer months in Devon tend to have the more chilled. Another thing I'm perceiving is that whilst I think that more drivers are giving more room, a significantly higher number are taking risks with oncoming traffic, as they do in France: either a wide overtake over the white line forcing the oncoming drivers to veer towards the gutter/side of the road, or on completely blind bends. The latter troubles me especially when it's a right-hand bend, and the driver can see far less than me: if they smash into a car they couldn't see, not only will it endanger the car drivers & passengers, but I'm at significant risk of getting squashed by the high-speed collision carnage.