A letter report issued by the Government Accountability Office with an abstract that begins "The process to complete highway projects is complicated and lengthy due to multiple factors. Specifically, highway projects can involve many stakeholders, including agencies at all levels of government, nongovernmental organizations, and the public. These stakeholders perform a number of tasks—for major highway projects, as many as 200 steps from planning to construction—but their level of involvement varies. For example, resource agencies like the U.S. Army Corps of Engineers or the U.S. Fish and Wildlife Service generally only become involved in a highway project if it affects the environmental or cultural resources that agency is tasked with protecting. Additional factors can lengthen project time frames, including the availability of funding, changes in a state’s transportation priorities, public opposition, or litigation."