 I-73 then runs west to NC 68, near PTI Airport then north 8 miles to back to US 220 near the Haw River.It then proceeds 4 miles further north along a newly widened stretch of US 220 to the interchange with NC 68 which was completed in December 2017, but not signed as I-73 until March 2018.Authorized by the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA), Interstate 73 was established as a north-south high priority corridor from Charleston, South Carolina to Detroit, Michigan.