N.C. Gen. Stat. § 143-345.10

Maintenance vehicles of the Department of Administration may park without charge at any metered parking space located on the street blocks bordering the State's Capitol Square when performing work at or on the State's Capitol Square. No maintenance vehicle shall be parked upon the State's Capitol Square in a location that obstructs the view of or access to any monument on the Square, unless the vehicle itself is needed to perform some maintenance function or duty required by this Article.