If you really wanted to be scared by low flying while driving.....
There used to be (maybe still there?) a falconry centre near Austwick in the Yorkshire Dales. One of the inmates was an Andean Condor called Carlos who used to be excercised over the cliffs to the north of the A65 (easier to launch him off a crag). His handler used to claim that Carlos enjoyed himself by chasing motorbikes along the road and caused a few near things. However, Carlos' best trick was to surf on the bow wave of large lorries heading towards Skipton. I am sure that his 9' wingspan caused a few heart flutters.
(The centre also had a bald eagle, but he was flown over a different area as he and Carlos did not get on).
W.