The local environmental group River Fields and the National Trust for Historic Preservation are suing the Federal Highway Administration. The groups want the government to reconsider approval of the massive transportation project, which they claim was granted illegally. The plaintiffs have issued statements saying the project should be reevaluated since it was approved six years ago. They also say the highway administration, which has not yet commented publicly on the suit, failed to follow environmental review guidelines. The Bridges project has been the focus of controversy in Louisville, both for its design as well as its expected cost.