Automobile ownership was rare in Sabresia as recently as 30 years ago, but with continuing growth of personal income there, automobile ownership has become steadily more common  Consequently, there are now far more automobiles on Sabresia' s roads than there were 30 years ago, and the annual number of automobile accidents has increased significantly
Yet the annual number of deaths and injuries resulting from automobile accidents has not increased significantly
With more and more people owning cars, the average number of passengers in a car on the road has dropped dramatically.