4. Philadelphia, Penn. made the list since its high density of schools keeps speed limits low in many neighborhoods, making the streets safer for walkers.

Parked cars are shown outside of the stadium with the downtown Philadelphia skyline in the background before the start of the <a class="taxInlineTagLink" id="EVSPR00003532" title="National Football Conference" href="/topic/sports/football/national-football-conference-EVSPR00003532.topic">NFC</a> Championship game on January 23, 2005 in Philadelphia.

( Photo by Harry How/Getty Images / July 13, 2012 )

Parked cars are shown outside of the stadium with the downtown Philadelphia skyline in the background before the start of the NFC Championship game on January 23, 2005 in Philadelphia.

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