Urban Planning Ph.D. student and transportation scholar Eric Morris contributed to the Freakonomics blog on the New York Times, explaining reasons behind the stablization of car ownership. Among an increase of ridership of mass transport systems and higher fuel prices, Morris theorizes based on new data sets and various possibilities attempting to explain why there hasn't been an increase of cars on the road.
But surprisingly, the 2000s appeared to see a halt to that trend, with driving totals stabilizing by decade’s end. Why? I definitely think I would have noticed if there was a colossal world war going on, so are there any other possible explanations for the slowdown?"
Source: New York Times