N.C. Gen. Stat. § 160A-309

A city may contract with a developer or property owner, or with a private party who is under contract with the developer or property owner, for public intersection or roadway improvements that are adjacent or ancillary to a private land development project. Such a contract is not subject to Article 8 of Chapter 143 of the General Statutes if the public cost will not exceed two hundred fifty thousand dollars ($250,000) and the city or its designated agency determines that: (i) the public cost will not exceed the estimated cost of providing for those public intersection or roadway improvements through either eligible force account qualified labor or through a public contract let pursuant to Article 8 of Chapter 143 of the General Statutes; or (ii) the coordination of separately constructed public intersection or roadway improvements, and the adjacent or ancillary private land development improvements would be impracticable. A city may enact ordinances and policies setting forth the procedures, requirements, and terms for agreements authorized by this section.