To relieve congestion in the county, the Legacy Parkway began construction in 2006. Construction began near the US-89/I-15 interchange in Farmington in 2004, but was soon halted due to a lawsuit filed by environmentalists, who were concerned that the road would harm marshlands along the eastern edge of the Great Salt Lake. They requested an independent evaluation for completeness of the environmental impact statement. A settlement was reached in 2005 and the final injunction was lifted in 2006. The Legacy Parkway opened in 2008, running from the US-89/I-15 interchange in Farmington southward to connect with I-215 near the border with Salt Lake County. An extensive trail system, wetland protection measures, and landscaping were implemented along the highway in response to the environmentalist's concerns, in addition to a lower speed limit and a ban of semi-trailer trucks on the highway. However, this compromise will expire in 2020, and the roadway is expected to begin functioning under normal Interstate System regulations (i.e. trucks and higher speed limits allowed).