Limiting car usage can prevent accidents and deaths by cars. Experts say passenger cars are responsible for 12 percent ofgreenhouse gas emissions in Europe and up to 50 percent in some car-intensive areas like the United States. If people took their bike or walked to their destination it could help people lose weight and be healthy.

Congestion was down 60 percent in the capital of France, after five-days of intensifiying smog. Beijing, China is known as one of the most polluted cities in the world. Last week Paris had 147 micrograms of particulate matter (PM) per cubic meter compared with 114 in Brussels and 79.7 in London, Reuters found.

Car-free day became a big hit in Bogota, Colombia. The day without cars is part of an improvement campaign that began in Bogota in the mid-1990s. It has seen the construction of 118 miles of bicycle paths, the most of any Latin america city, according to Mockus, the city's mayor.

Cars should be cut down in use in many other country's espically in places like the U.S where cars are used all the time. Experts say America's love affair with vechicles seems to be cooling. Miles driven in the U.S peaked in 2005 and has been dropping since according to Doug Short of Advisor Perspectives. As of April 2013, the number of miles driven per person was nearly 9 percent below the peak and equal to where the country was in January 1995.

There are the many reasons and what places are doing to reduces the usage of cars.