FastCompany have an article about Peak Car:

The growth of public transport and the reversal of urban sprawl have also played a role, as more people in concentrated areas leads to more central shopping locations. Cities have also seen the growth of a culture of urbanism, resulting in more people who enthusiastically take public transportation, walk, and ride bikes.

Find out more at http://www.fastcompany.com/1764562/have-we-reached-peak-car-use