New study finds the average American commuter spends 34 hours stuck in traffic each year. Photo by Andrés Nieto Porras.

Researchers in the U.K. investigate how to effectively encourage fuel-efficient cab driving. Photo by Fabrizio Lonzini.

Salvadore, Brazil's BRT moves forward with a call for funding. Photo by Rodrigo Suriani.

Japanese and U.S. companies team up on smart grid project in Maui, Hawaii. Photo by Marks Jonathan.