DeVon Douglass defines the murky term in her own words.
Mike Simons of the Tulsa World is traveling on foot in the parts of his city that most people drive through as fast as they can.
And where bike commuting has been growing the fastest.
This crash detector will send GPS coordinates to the authorities if you sustain a severe head impact.
Also, Sioux City bars texting while driving and a notorious hoon gets jailed in Australia.
A map of the country's most intriguing mayoral races, city council competitions and referendums
A survey of 55 major U.S. cities shows big gains in many places, but plenty of regional variation