George Haugh

Dallas is hoping to break the ring of concrete created by the surrounding Central Expressway and Interstates 30 and 35.

Last year Toronto became the first North American city to mandate green roofs on all new residential, commercial and institutional buildings larger than 21,500 square feet. Now it has created a 118,000 square foot example on top of the City Hall.

Authorities in Los Angeles are working on a grand plan to unify the city's core with a new Downtown Civic Park Project.

Washington D.C. became the latest city to launch a bike share scheme Monday. "Like bees tumbling from the nest, scores of riders on ruby-red bicycles swarmed from a lot near Nationals Park to establish Capital Bikeshare," writes Ashley Halsey.

As Amtrak seeks to create and expand high-speed passenger train operations in the United States, the company on Thursday named Philadelphia rail expert Albrecht "Al" Engel to head its new high-speed rail department.