The concept of "complete streets" — with bike lanes, sidewalks and room for mass transit — has attracted a diverse national alliance of supporters, including advocates for senior citizens and the disabled.

Fourteen states, six counties, 10 regional governments and 52 cities have complete streets policies, according to the National Complete Streets Coalition. In Illinois, a complete streets bill awaits the governor's signature. In California, a bill passed one house.

Massachusetts and at least 11 cities — including Seattle, Honolulu, Chicago, Salt Lake City, Madison, Wis., and Jackson, Miss. — have approved complete streets policies since last year, the coalition says.

Some states, such as Oregon and Florida, have had the equivalent of complete streets policies for years, but the "overarching concept jelled just in the last few years," coalition coordinator Barbara McCann says.