I-295 in Fayetteville should be 70 mph and yet it's only 65.
I-40 from Hillsborough to Raleigh should be 70 mph too.
I-40/I-85 from Greensboro to Hillsborough should be 70 and it's only 65 for some unknown reason.
I-40 from I-840/I-73 to the I-74 interchange in Winston-Salem. should be 70 and its posted at 65.
I-40 from Garner to Raleigh.
I-40 in Statesville is 60 mph, but the reason why is because it's substandard. Will probably be raised to 70 mph when rebuilt.
I-77 in Statesville is only 55 mph, but when rebuilt the fastest it will probably go to is 65 mph due to tight ramps.
US-70 (future I-42) in New Bern. Was 55 mph, but then raised to 60, should have been 65 but will probably go to 65 once the James City upgrades are complete.
I-73 north of Greensboro on the freeway that opened in 2017, why 65? Should be 70!
I-74 from the I-85 interchange in High Point to I-73/I-74 should be 70 but its posted at 65.
The Monroe Expressway. Should be 70 mph but for unknown reasons, it's only 65 mph.
To add in my home town, Memorial Drive (NC-11) has a short speed limit drop near Dickinson Ave. It drops from 45 mph to 35 mph between Maxwell Drive to the Norfolk Southern railroad track.