Economic Success -- For A Price

"Now, traffic congestion strangles roads and tailpipe emissions threaten the unsullied air that helped push the Gem State -- with nearly 1.3 million people -- to fifth on the nation's list of fastest-growing states during the 1990s. The good news, some say, is that Idaho is ahead of its counterparts in the West's larger population centers, debating transportation policy and urban design before its largest metropolitan area's population tops the half-million mark."