The six-lane 36.8-mile Triangle Expressway is North Carolina's first
modern toll road and the largest transportation infrastructure project in the state's history.
The original 18.8-mile Triangle Expressway, completed in December 2012 at a cost of approximately $1 billion, utilizes all-electronic tolling technology while improving travel in the region and commute times in and out of Research Triangle Park. The Complete 540 Phase 1 extension of the Triangle Expressway, opened to traffic on Sept. 25, 2024, and extended the roadway an additional 18 miles from N.C. 55 to I-40/U.S. 70 (future I-42).