9/11 and car crashes

It's estimated that 1,000 additional deaths occurred in the months following 9/11 because Americans chose to travel by car instead of a plane.

In the wake of the terrorist attacks of September 11, 2001, many Americans started driving more due to a fear of flying and lost their lives in traffic accidents. But why did this happen more frequently in some states than in others? And why didn't Spanish driving habits change in the same way following the 2004 train bombings in Madrid? Wolfgang Gaissmaier and Gerd Gigerenzer from the Harding Center for Risk Literacy at the Max Planck Institute for Human Development in Berlin present new findings on this topic in the journal Psychological Science.

As we all know, the terrorist attacks of September 11, 2001, changed the world: The feeling of vulnerability led to the so-called "war on terror." New laws were passed, and surveillance intensified to reduce the risk of direct damage resulting from terrorism. But terrorist attacks also cause indirect damage. This comes about through people's thoughts and fears in reaction to such attacks. In the case of 9/11, it was primarily a severe loss in the aviation and tourism industries. Earlier studies showed that, following the terrorist attacks, more people chose to drive rather than fly, feeling it was safer. The result was not just a greater risk of traffic congestion: in the twelve months following September 11, 2001, there were an estimated 1,600 more accident-related deaths on American roads than would have been expected statistically.

But why would such an increase in traffic and, with it, also in traffic deaths be observed only in some states and not in others? And why was no increase in driving and traffic accidents seen following the likewise devastating train bombings in Madrid in 2004? Psychologists Gaissmaier and Gigerenzer from the Max Planck Institute for Human Development and the Harding Center for Risk Literacy based there present new analyses, which will soon be published in the journal Psychological Science.

The analyses show that car traffic increased, particularly in the New York vicinity. The main attacks were focused on the World Trade Center located there. These images, and thus also the fear, were presumably particularly present for people who lived in the surrounding area; other studies also support this assumption. However, the authors further identify a second, even stronger factor that could explain why the traffic volume increased sharply even in some states far away from New York, especially in the Midwest: the infrastructure was simply very well suited to replace flying with driving. The streets were very well developed to the number of inhabitants, and many cars were registered.

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