Here’s an interesting article published in Psychological Science in 2004.
Basically, the results suggested that in the first few months following 9/11, because many more people in the States drove their cars longer distances, being fearful of flying, the increased number of deaths on the roads were actually greater than the number of people who died in the 9/11 planes.
There are some who disagree with their conclusion, saying that we don’t really know the reasons why people chose to drive instead of flying. Rose suggested that people may have opted for the car because they feared, not the flying, but the long security procedures at the airports!
But an interesting study, none the less, I thought.