Some major European cities are making efforts to make the cities more pedestrian friendly by restricting liberties to personal automobiles. The idea is that the less access to the streets that cars have, the more citizens will be walking, biking, or using public transportation.
The idea is a great big city initiative, especially for European cities that already have great public transportation access. This could be a potential model for big cities of the United States. However, consideration of the ultimate destination must be taken into account. Outside of large urban areas, having a personal car may be the only way to get to where someone needs to go. For movement in the heart of the city, in many U.S. cities (including Detroit), the first priority is improving public transportation.